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
I can easily imagine this not being a necessary, anymore. Just let the website using this WEI API automatically disable all browser extensions on a WEI-enabled site. Why not, after all? Why should you dictate the traffic you receive on your computer? Why should you own anything?