... the greatest danger to us is masterless men; lacking a coercive power to tie their hands, they would destroy society. How else but by binding to lord and master can they be held to the laws? So thought men during feudal times.

In fact, it is possible for people to be held to good conduct without being bound into a single hierarchy, and it should be possible for software to be held to good conduct without giving such power to single monopolists. But it's not in Google's interests to build such mechanisms, any more than it was in the interests of the feudal overlords to look for alternatives to their rule.

I'm supposed to be the master, actually. It's my computer, any foreign code is essentially a subject in my digital domain. It should be literally impossible for them to do something I don't want them to do. As the god of my little digital realm, I should have maximum power and freedom. Foreign developers should have the minimum set of permissions, ideally none.

The fact someone gave developers a turing complete language inside the browser where random code is automatically downloaded and executed is a major reason why we even have uBlock Origin in the first place. The vast majority of developers heavily abuse this privilege and cannot be trusted, and that is why we block them with extreme prejudice.