To people thinking of joining Nebula because their marketing team/shills are currently spamming this thread, see peertube (federated like lemmy, open source)
Peertube is fine, but like lemmy (but worse), there's barely anything there. Nebula at least got creators from YouTube to make ad-free versions for Nebula. If the channels that a person are subscribed to don't exist in Peertube, that's not an appealing alternative for them.