This may be a bit much for the free tier Proton servers, but here's a 2-part pitch:

(1) functional Zoom alternative

(2) Maybe a feature of said alternative or another feature entirely for a "shared canvas" "chat room" type thing? I've heard about multiple people meeting up online in a kinda Zoom-ish meeting/chat room where they have a canvas that they can create art with and write messages - and option for mic to be muted or on was available. Not sure if it's an app or a website or what, but it seemed really cool and wondered if there was a privacy-first version.

Maybe the second one is too much for the servers though, just wanted to pitch it anyway in case anyone else thinks it's interesting!