I signed up for nebula too, but it's clear that nebula is not a competitive platform. Nebula does the basics, it has channels and it shows videos, that part is great.

Youtube is great because of the wide availability of videos, recommendations and (maybe not great because of this) the comments.

I know the comments are not that well liked, but it means the videos are not in a vacuum. They are in a social context. And comments are pretty good, maybe because negative ones are heavily suppressed, that's at least what it looks like.

Nebula feels empty because of those missing parts. It doesn't draw you in to new channels. I don't like half the recommendations youtube gives, but some of them I do.