EDIT ---
Ok, I get it now. Personalized ads = surveillance. Fair enough.
Doesn't the whole GDPR already cover it though? You can opt out of the surveillance.
Now if you have been looking for something else that you want to keep private (gay clubs, abortion clinics, or anything embarrassing) then your phone has betrayed you.
There is also a point that if the ad is more useless, the quantity of ads should decrease because advertiser will not find them worth it.