It isn't the managers it is the business. All those geniuses hired and over years and years no one came up with another business model but ads. I pay for ad-free YouTube and would happily pay for ad free search. As would many. Many people would like a google scale micropayments system that isn't ads. The failure to do this led directly to social media becoming customer devouring experiences rather than making good products people want.
Paradoxically, the people who pay for adfree experiences would be the most valuable targets for ads, so I suspect any pay for no ads arrangement will be temporary at best.
> All those geniuses hired and over years and years no one came up with another business model but ads
This isn't true, there were many other ideas. It's just that only KPI was how much money they can make, thus ads won. Companies don't have an axis of ethics or morality.
I think we are talking past each other. I'm saying there are proposed models which are not ads, but they don't maximize earnings. A silicon valley company will always choose earnings over anything else.