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 generally would recommend Libreoffice over AOO but not sure about cloud sync options
Interesting. Well, I did find Gnumeric in my search for a simple spreadsheet app for making flashcards with, so TIL something new I guess my "cloudsync" can be using syncthing or just backing up to a flash drive lol