Firefox still allows uBlock origin, and even on mobile.
That strategy did not come into existence through some abstract entity
Even moreso - uBlock Origin doesn't block the modern equivalent of pop-up ads unless you manually block elements. Even then - half the time the block isn't even saved and needs to be redone every page visit.
Have you got an example of that?
Google for quite a few years was seen as a good steward of the free and open Internet.
To assert people shouldn't feel betrayed because "it's a company" fundamentally ignores why people had different expectations for Google to begin with.
The problem is that people are quick to assume a company is being altruistic just because the financial incentives happen to align with their own incentives.
You're using a web browser built by a company whose primary income is advertising. What did you think would happen instead?
A lot of people have this weird idea that companies are their friends and would defend their interests despite large financial incentives to betray that trust.