We should have outlawed targeted advertising and Google should have been broken up under antitrust a long time ago.
(Context was email services when they rolled out gmail worldwide)
Easy enough to run the ad-engine over the query, estimate the ad revenue, and bill the user the value of the lost revenue.
They are free to recoup that by serving their own ads or even using Google's ad services.
Exactly why it seems to make sense to be willing to disrupt yourself.
There are so many ways to still make money.
But, I'd be willing to bet that avoiding self-disruption increases the likelihood of failure over longer timescales.