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
The people who designed Gemini (and those who designed Gopher, and who did IRC, and...) have already gone to vast lengths explaining why it has to be redesigned from scratch, including new language and protocol. tl;dr: if you keep using current HTML, you have no way of preventing people from using eg.: