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
no, the "drm" doesn't actually run 100% of the time, invoked only once to generate the key for server to verify. there's no flag or mode to switch into like with widevine.
I didn't say it does. But for the subject websites, which will be almost all of them eventually, all adblocking or code interactive plugins will be useless.
I can easily see news sites, especially those with any video content, will be impossible to use, because if you look at them without Adblock enabled, they're a mess of ads, it's almost doubtful you can find an article in the page.
This is just laying the groundwork for more unblockable ads.