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One question would be if your advertising revenue dropped when you stopped PMAX and only ran on Meta. If google + meta generated more purchases than it would have otherwise, then google was integral to generating those purchases.
If the funnel is such that they are just googling your brand after seeing you on meta, then you can exclude your brand terms on pmax.
If they are going to the site off the meta ad, then googling you later, you could first define an audience in GA4 of traffic coming from facebook ads and then add that as an audience exclusion list at the account level to affect all campaigns. Pmax won’t allow you to exclude them from its own controls.
