Absolutely. But there’s the catch - if Google passes this (and they will, because they don’t like ad blockers since it hurts their revenue), others will implement it.
Other Chromium browsers will be forced to adopt Mv3 too. If they don’t adopt it, the users that continue to use those browsers will find that certain web sites or services won’t work, and they’ll uninstall them and leave the service. “Why can’t Opera/Brave load my stupid bank? This is so stupid. I just want to check my balance. Whoa! It works in Chrome! That’s awesome! Why are these idiots at Brave even developers if they can’t fix the simplest shit? They should learn from Google, I’m switching to Chrome.”
And thus, Google Chrome isn’t necessarily “a monopoly”, because other Chromium browsers will adopt it if they want to stay in business. Opera belongs to China, Brave feeds their advertisements and has Basic Attention Token (BAT) cryptocurrency, Microsoft Edge is everything Google is but with a heaping pile of Microsoft privacy invasions. They’ll adopt it, they don’t have a choice.
Other Chromium browsers like Ungoogled Chromium, which is made by voluntary developers in their free time, will not adopt it. But because they’re unpaid, how long can they fight Mv3? Eventually, Ungoogled Chromium will disappear.
Firefox and its forks (Librewolf, Waterfox, etc.) are safe for now. In 10 years when Web sites don’t work, if they don’t adopt Mv3, they too will disappear. Firefox is a corporation that has salaries and a bottom line - they’ll have no choice but to comply or they will perish.
The only way this can somehow get turned around is if Google is upended and a new competitor emerges that the majority of users flocks to. The largest competitor is Firefox, which is not Chromium. Web developers and corporations design their services for the majority of users, so maximum compatibility is for Chromium. I don’t see that happening ever. Hopefully Brave and Microsoft have enough power and decide they don’t want to use Mv3. That’s our only chance.