This isn’t really specific to federated software. The client can go offline but the server can’t. Same applies to all centralized services. The only place this really applies is for decentralized (as in, no central points) systems, and those tend to have a lot of special sauce to make other people being offline less painful
All depends on your definition of “properly secure”. As far as I know, most users do not host their own server
if it’s not free what’s the benefit of using PeerTube? You’re basically describing nebula
You’re allowed to upload the same .mp4 file to multiple websites. There’s absolutely no reason why a creator that isn’t getting YouTube ad money couldn’t upload to YouTube and PeerTube at the same time. Presumably if they are getting YouTube monetization, they have some kind of exclusivity agreement.
Seems unlikely that a creator would jump ship from a platform that pays them to a platform that doesn’t. That being said, lots of creators also constantly complain about demonetization, so maybe they’ll start to get fed up and move to purely in-video sponsorship things. Seems most likely from a creator that’s already on a platform like nebula
Signal is too darn secure. Much better to have one dude who probably knows how to use a crypto library build the whole thing over again with a coat of ActivityPub on top