google has a monopoly on search ads and does enforce it, being a drain on the economy since in many fields you only succeed if you spend on search ads
If someone could convince the courts that this is correct, then I'm sure Google would lose. However, I bet dollars to donuts Google's counter-arguement would be that the people doing the searching and quickly finding information are also consumers, and they outnumber advertisers and may be harmed by any proposed remediation in favor of advertisers.
Search isnt a single category. If you break it down, they arent a monopoly. For example. 1/2 of PRODUCT SEARCHES begin on Amazon. It's probably hard to argue Google as a monopoly if who they see as their main competitor has half the market share.
It's a tall order to convince the courts that Google's actions consumers, or is illegal: after all, being innovative in ways that may end up hurting the competition is a key feature of a capitalist society - proving that a line has been crossed is really hard, by design.