Manifest v3 is entirely avoidable. You have the option (on most proper systems) to select a browser for yourself and protest Google's client-side issues. If you're having Manifest v3 shoved down your throat, it is probably your OEM's issue more than Google's.
What isn't competitive and will be scrutinized, is Google's AdSense business.
Who would have guessed: profiting off video streaming is prevented by making adblock accessible. News at 11.
I'm entirely sympathetic to the idea that Google abuses their advertising business, but people demanding Google get taken to court for making Chrome-only sites are going to be sorely disappointed. The internet is a free market that will converge on the most attractive featureset even if it's not healthy for users. That means that all businesses that rely on advertising like Google does for YouTube will inevitably end up with a similar strategy. Twitch.tv certainly isn't controlled by Google, but they'll happily degrade an adblocker's experience until it's unusable because ads are their moneymaker.
If you don't want to use Firefox, try WebKit. You'll gain an appreciation for "not as good" as opposed to "barely functional", trust me.
What isn't competitive and will be scrutinized, is Google's AdSense business.