I believe everyone should keep in mind that nostr is a protocol, not the content, and it's just for text (notes and stuff transmitted over relays) That's how it's designed, and for anything beyond that like image hosting or livestreaming, that will need to be (and is, awesomely) set up and maintained as its own "thing".

It's the framework, the rules, for everyone to work together as they see fit, cryptographically ensuring an individual identity.