I believe the real question is just as we believe Bitcoin will have a better network effect than fiat system because has the right incentive structure; will Nostr do the same against Instagram, X or whatever?
Another aspect of this if doing what youtube does is possible without a central server.
Listened nostr:npub1gu47n7fxfm4py48jktmu6tdqcvva4e87fntynuzzf62zxnw2e7tsc6907g recently talking about this in his IRL and it was a good one.