Essentially, everything is Chrome, Firefox or Safari.

Brave, Edge etc are chrome.

Most people are using chrome.

Google controlling chrome controls what the vast majority of people use to see the internet, and then they change chrome to make it harder for you to block ads that they want to show.

There’s no reason for chrome to break ad blockers unless it’s owned by an ad company.

Edit: Google done some other shady things by owning it in the past as well.