Thankfully I have no need for cloud at all, but I agree that Cryptomator is a really good tool.
I'm in LibreMemes, a place for r/linuxmemes refugees where any tech memes are welcome. https://matrix.to/#/#librememes:nitro.chat
I also stick with NewPipe, as it is fully libre. Vanced/ReVanced were just mods to the proprietary YouTube app.
Maybe Void's XBPS.
Sadly no. Matrix is not a part of the fediverse.