There’s not much they can do about PGP, though. Sure, encrypting stuff manually can get a little bit annoying, but nothing a quick browset extension wouldn’t fix.
The moat difficult part will ve convincing your friends to use it, and actually sharing keys, but if you really need to hide what you’re talking about, it’s not like stopping a e2e rollout will help in amy capacity. Quite the contrary - people who they want to target with this will only start to be even more carefull, reaulting in them loosing access even to those backdoored privacy messengers they already probably have and criminals rely on.