Google Grants Advertisers Greater Control Over Performance Max Campaigns Through New Network Exclusion Pilot

In a significant departure from its long-standing "black box" approach to automated advertising, Google has begun testing a new feature within its Performance Max (PMax) product that allows media buyers to exclude specific inventory sources. This pilot program, which has surfaced in the consoles of a select group of global advertisers, provides the ability to opt out of third-party Search Partners and the Google Display Network (GDN). For an industry that has spent the last four years grappling with the opacity of Google’s flagship AI-driven campaign type, the move represents a rare concession by the tech giant to marketers demanding more granular control over their digital ad spend.

The Performance Max platform was designed to streamline advertising across Google’s entire ecosystem—including Search, YouTube, Display, Gmail, and Maps—using machine learning to optimize for conversions. However, since its wide-scale rollout in 2022, the product has been a source of both success and deep frustration. While it often delivers high volumes of conversions, media buyers have frequently complained about the lack of transparency regarding where ads are actually appearing and the inability to prevent spend from flowing toward lower-quality, "remnant" inventory.

The Mechanics of the New Control Levers

The new feature manifests as two distinct checkboxes within the Performance Max campaign settings. Although these options are enabled by default—aligning with Google’s preference for broad automation—users included in the pilot can now manually deselect Search Partners and the Google Display Network.

Search Partners refers to a network of hundreds of non-Google websites, as well as YouTube and other Google sites, where search ads can appear. The Google Display Network encompasses over two million websites, videos, and apps where display ads are eligible to run. By allowing advertisers to opt out of these channels, Google is effectively permitting them to narrow their PMax campaigns to "mainline" Google Search and higher-priority surfaces.

According to media buyers who have gained early access to the console update, the change is a direct response to the "junk inventory" problem. Search advertisers have traditionally been wary of the Display Network within a search-centric campaign because display traffic often behaves differently than high-intent search traffic. David Dweck, president at Go Fish Digital, noted that both Search Partners and the GDN have historically been viewed as sources of remnant inventory that Google essentially forced advertisers to accept as part of the PMax "all-in-one" package.

A Four-Year Evolution: From Black Box to Incremental Transparency

The introduction of these exclusion toggles is the latest step in a chronological shift toward transparency for Performance Max. To understand the significance of this pilot, it is necessary to look at the timeline of the product’s development and the growing pressure from the advertising community.

• 2021–2022: The Launch Phase. Google introduced Performance Max as the successor to Smart Shopping and Local campaigns. It was marketed as a "goal-based" campaign type where the AI would handle all the heavy lifting. Early adopters criticized the lack of reporting, famously dubbing it a "black box" because they could not see which channels (e.g., YouTube vs. Search) were driving results.
• 2023: The First Concessions. Following significant pushback, Google began adding basic reporting features. This included "search term insights" and "asset group reporting," which gave buyers a glimpse into what was happening under the hood, though they still lacked the "levers" to change it.
• 2024–2025: Refinement and Reporting. Google introduced campaign-level negative keywords and first-party audience exclusions. These tools allowed brands to prevent their ads from appearing for specific branded terms or being shown to existing customers, restoring a degree of confidence among high-spending agencies.
• July 2026: The Network Exclusion Pilot. The current pilot represents the most aggressive move toward manual control yet, allowing for the complete removal of entire segments of Google’s ad inventory from the PMax algorithm.

Sam Clarke, managing director and head of search at Crossmedia, described the development as "fairly significant." He noted that the lack of strategic levers was the primary pain point for practitioners who felt they were losing the ability to guide their clients’ budgets based on specific performance data.

Industry Reactions and the Demand for Access

The rollout of the pilot has been discreet, with some agencies discovering the features in their dashboards without prior notification from Google. This has led to a surge in demand among media agencies that have yet to be included in the test. Reports from the field suggest that Google agency representatives have been inundated with requests for access, many of which are being denied as the company keeps the pilot group limited.

James Viney, senior paid media account manager at Roast, indicated that gaining access has not been easy for everyone, highlighting a "queue" forming among agencies eager to test the impact of excluding the Display Network.

For those who have gained access, the results have been encouraging. Kaitlin McGrew, head of SEM at independent media agency PMG, observed that the increased reporting and control features have actually led to a lift in PMax spending. When advertisers feel they can "manipulate" and "double down" on what works while cutting out what doesn’t, they are more willing to shift budget from traditional Google Shopping campaigns into PMax. PMG reported an average increase of 10% in PMax investments among clients who utilized these new insights.

The Competitive Pressure: ChatGPT and the AI Ad War

Google’s sudden willingness to grant more control to advertisers does not exist in a vacuum. The competitive landscape for search and AI-driven advertising has shifted dramatically in early 2026. The launch of ChatGPT’s dedicated ad platform in February 2026 marked the first credible threat to Google’s search dominance in over a decade.

OpenAI has moved with unexpected speed to court the advertising community. In the six months since its ad product debuted, the firm has introduced a conversion pixel for tracking ROI, piloted high-engagement video ad formats, and expanded its ad network into key European markets including France, Germany, and Ireland.

For many marketers, the allure of ChatGPT ads lies in the high intent of conversational queries and the novelty of the format. If Google appears too rigid or "locked down" with its PMax product, it risks losing experimental budget to OpenAI. By offering more control, Google is effectively attempting to "sticky" its relationship with media buyers who might otherwise be tempted to diversify their search spend elsewhere.

Financial Context and the Cooling of Search Growth

The financial stakes for Google’s parent company, Alphabet, are immense. In its July 23 report, Alphabet announced that search revenues reached $63.27 billion for the second quarter. While this represents a 17% increase year-over-year, it is a noticeable slowdown from the 19% growth recorded during the same period in 2025.

This "mild cooling" of revenue growth suggests that Google must work harder to retain every dollar of ad spend. When search revenue growth slows, the company often responds by either increasing the volume of ad slots or by making its existing products more attractive to high-spending agencies. This pilot program falls into the latter category. By giving media buyers the "steering wheel" they have been asking for, Google ensures that Performance Max remains the primary vehicle for search spend, even as competitors circle.

Broader Implications for the Future of AI Advertising

The PMax network exclusion pilot signals a broader trend in the maturation of AI-driven advertising. The initial phase of the AI revolution in marketing was characterized by a "trust the machine" ethos, where platforms argued that human intervention only served to decrease efficiency. However, as the technology has scaled, the industry has realized that AI requires "guardrails" to be truly effective for brand-conscious and performance-oriented advertisers.

The ability to exclude the Google Display Network and Search Partners is more than just a technical update; it is a recognition that human strategic oversight is still a vital component of digital marketing. Practitioners like Kyle Rovinski of Duncan Channon have noted that being forced to opt into inventory they didn’t want led to a breakdown in trust. "You could not trust it," Rovinski said of the earlier iterations of PMax.

If this pilot proves successful and moves toward a general release, it could set a new standard for how other platforms—including Meta and Amazon—structure their automated ad products. The "North Star" for Google, as stated by a company spokesperson, is to empower advertisers with visibility and the ability to "confidently steer" campaigns.

For the global advertising community, the message is clear: the era of the total "black box" may be coming to an end, replaced by a hybrid model where AI handles the heavy lifting of optimization, but humans retain the final say on where their brand appears and how their capital is deployed. Whether this will be enough to maintain Google’s 17% growth rate in the face of rising AI competition remains to be seen, but for now, the industry is welcoming the return of the checkbox.