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
How does it impact Chromium?
chromium is just striped down chrome ,yeah its open source but google is the main contributor meaning the final decisions are up to them to accept or refuse ( or even force)
By making DRM-abiding browsers a requirement?
yep just like some websites do with user agents
Chromium is the open source part of Chrome. I've actually run Chromium before, but it's kind of hard to find a binary release. Chromium lacks some Google additions like an mpeg player and PDF reader. It's also free of some annoying add-on stuff like that app tracker that runs a background process full time. Who knows what that process does really. Of course I have it disabled on my system, but you have to go out of your way to kill it.
Otherwise Google has the Chromium project under their thumb so they're not going to do anything Google does not approve of or refuse to do anything Google wants them to.
Speaking of Google influence, it bothers me that Google is a big contributor to Mozilla. I think it's mainly to stay out of hot water with the FTC. They know all too well what happened to Microsoft and Internet Explorer in 2001. They need to keep the competition alive. Still it makes me cringe knowing they could exercise their will on them as a big contributor. I mean everyone has a price, and in Silicon Valley it's not very high.
You won't be able to use it. Only genuine Google Chrome.