Branded search is the cheapest, highest-intent traffic you buy. Someone types your name; they already want you. The cost per click should be tiny and the conversion rate huge. That is exactly why it is the easiest place for Google’s automation to quietly pad its numbers.
AI Max and broad match do not match literal keywords anymore. They infer intent. And inferred intent keeps wandering into your own brand-name queries, so your generic campaign starts bidding against your brand campaign, on traffic you would have won for pennies. Your cost per click creeps up, your reported ROAS looks great, and your attribution quietly breaks. Here is how to see it and stop it.
01 Why automation drifts onto your brand
Branded clicks convert at a rate generic traffic never will, so any system optimizing for conversions is magnetically drawn to them. When AI Max or broad match is told to find conversions, the cheapest, surest conversions in the building are people already searching your name. The algorithm does what you asked. It just claims credit for demand you already created, and charges you a higher price to do it. This is your own account bidding against itself, as some practitioners have put it.
02 What it costs you
Three bills, and only one is obvious.
- Higher CPCs. Two of your campaigns in the same brand auction push the price up. You pay more for clicks that were nearly free.
- Inflated ROAS. Branded conversions are the most over-credited in all of paid search. When AI Max absorbs them, its reported return looks spectacular and you scale a campaign that is harvesting, not prospecting.
- Broken attribution. With brand demand smeared across a generic campaign, you can no longer tell what your prospecting did. The number you scale on becomes fiction.
03 How to detect it in your account
Open the search terms report on your AI Max or broad match campaign and look for your own brand name, product names, and misspellings showing up as triggering queries. Two more tells: your branded cost per click is climbing for no external reason, and your dedicated brand campaign’s impression share is slipping as something else eats the auction. If you see brand terms in a generic campaign’s search terms, you have found the leak.
04 How to claw it back
1. Flip the unbranded-only setting
Google began rolling out a brand-controls toggle inside AI Max around mid-2026 that confines the campaign to non-branded traffic, using Google’s own index of brand entities rather than a list you maintain by hand. If you run a separate brand campaign, turn this on so AI Max stays in prospecting mode and out of your brand auction. It is the cleanest fix because it is a native setting, not a patch.
2. Add a shared negative brand list
Whether or not you have the toggle, build a shared negative keyword list of your brand name, common misspellings, product names, and brand-plus-modifier combinations, and apply it to every generic and broad match campaign. Keep adding variants as they surface in the search terms report. This is maintenance, not a one-time job.
3. Keep a dedicated brand campaign
Run your brand terms in their own exact or phrase campaign so you control that cheap, high-intent traffic deliberately, at a low bid, with clean attribution. Then watch its impression share to confirm nothing else is creeping back in.
4. Reconcile what is left with incrementality
Even cleaned up, branded search flatters its own ROAS, because much of it would have converted anyway. Before you trust the number, pressure-test it with a holdout, the method in the incrementality testing playbook, and judge prospecting on its real, incremental return rather than the inflated blended figure.
05 What good looks like
A clean account keeps AI Max and broad match on genuinely new demand, runs brand terms in a deliberate low-bid campaign with full impression share, and shows no brand queries in the generic search terms report. Branded CPCs settle back down, and the prospecting campaigns are judged on incremental conversions, not on the easy credit they used to steal. If you want the wider verdict on AI Max, we wrote it in our honest review.
06 Where to start
Pull the search terms report on your biggest AI Max or broad match campaign today and search it for your brand name. If your brand is in there, you found money. Flip the unbranded setting or apply a negative brand list this week, then watch your branded cost per click and brand-campaign impression share for the next two. If you want us to audit where your automation is double-dipping, send us your account structure. How much of your “best” campaign is just your own customers finding you?
Sources: 2026 reporting on AI Max branded-search controls and the unbranded-only toggle (PPC Land, TechWyse) and analyses of automated brand cannibalization and self-competition (Revvim); standard shared-negative-list brand-protection practice.
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Is AI Max bidding on my brand terms?
It can be, even without brand keywords. AI Max and broad match infer intent rather than matching literal text, so they drift into brand-name queries because those convert best. Check your search terms report for your brand name, product names, and misspellings appearing as triggering queries in a generic campaign.
How do I stop AI Max from cannibalizing branded search?
Use the unbranded-only brand-controls setting Google rolled out in 2026, which confines AI Max to non-branded traffic using Google's brand index. Back it with a shared negative keyword list of your brand name, misspellings, and product names applied to every generic campaign, and keep a dedicated brand campaign for those terms.
Why does branded search inflate ROAS?
Branded clicks come from people who already want you, so they convert at very high rates and would often convert without the ad. When automation absorbs that traffic, its reported ROAS looks excellent but reflects existing demand, not new sales. Validate with an incrementality holdout before scaling on it.
Should I run a separate branded search campaign?
Yes. A dedicated exact or phrase brand campaign lets you control cheap, high-intent traffic at a low bid with clean attribution, and gives you an impression-share number to watch. If another campaign starts eating the brand auction, your brand campaign's impression share will drop and warn you.
How do I find branded cannibalization in Google Ads?
Open the search terms report on your AI Max or broad match campaigns and look for brand queries. Two supporting signals: a branded cost per click rising without an external cause, and a falling impression share on your dedicated brand campaign. Brand terms inside a generic campaign's report confirm the leak.