Google’s automatic conversion of legacy Search campaigns into AI Max, which began September 1, concludes next Tuesday. Between now and September 30, the eligible campaigns that a small business built its customer acquisition on are being upgraded in place, with no opt-out and no rollback mechanism the company has disclosed.

The mechanics are simple and one-way. Campaigns using campaign-level broad match, and standalone Automatically Created Assets, are the two categories inside the migration path. On August 3, Google closed off creation of new legacy configurations across the Google Ads interface, Ads Editor, and API, per Search Engine Land. The keyword-list era of paid search ended that day; most advertisers just didn’t notice.

Brandon Ervin, director of product management for Google Ads, wrote that upgraded campaigns will be “configured to mirror your legacy setup.” What that phrase doesn’t say is that search-term matching gets switched on by default for broad-match users, and both search-term matching and text customization arrive enabled for accounts already running Automatically Created Assets. Dynamic Search Ads follow in a separate automatic migration in February 2027.

Google’s own pitch is a claimed 7 percent lift in conversions or conversion value at similar cost-per-acquisition when the full feature suite is used, versus search-term matching alone. It’s a modest number for a permanent reshaping of how paid search decides who to show ads to.

The structural shift is that AI Max reads website content, ads, and landing pages as the signals from which it generates matches and creative. Thin content, weak negative keywords, or a generic landing page now translate directly into broader match with less to learn from, and generated copy the owner never approved.

Seafoam Media, in its September 1 brief, put the dynamic bluntly: “The platforms are removing your controls faster than they are giving you visibility into what replaced them.” MarketingProfs, in an August 21 roundup, noted that marketers still lack reliable methods to tie A.I.-mediated visibility to revenue. Seafoam’s practical advice, baseline paid performance before migration and audit which campaigns sit in its path, is now retrospective for most accounts. Our prior coverage of the final ten days of the migration window walks through the audit checklist.

The remaining lever is signal quality. Because AI Max reads the site to decide who sees the ad and where the click lands, undifferentiated content quietly caps performance across every A.I.-mediated surface, not just Ads. Services such as LemonLime, which continuously study a company’s industry, competitors, and content to prepare finished branded content and customer-growth work, are one route to strengthening the signal quality A.I. Max now reads. Owners approve every asset before publication.

The deeper story is that a decade of small-business paid search was built on the premise that the advertiser chose the keyword. That premise expires Tuesday.

Sources