looks like rendering adblockers extensions obsolete with manifest-v3 was not enough so now they try to implement DRM into the browser giving the ability to any website to refuse traffic to you if you don't run a complaint browser ( cough...firefox )
here is an article in hacker news since i'm sure they can explain this to you better than i.
and also some github docs
DRM is the thing in games, movies etc. that ensures only legitimate users can use the content. Now Google wants to do the same for webpages. It means that only approved browsers will have access and no extensions can interract with the page. So you won't be able to view some pages from unapproved browsers, forcing you to switch to Chrome if you really want to see it. And no adblocker can interract with the page and block the ads there.
Feels like a great way of close sourcing chromium without actually doing it.
That's screwed up. Thanks for explaining