Videos earlier than on Youtube for most (i think) creators (the least valuable of the 3)
Exclusive bonus videos (this one i like, it varies what the exclusive is, but it is usually as high quality as the rest of the creators content)
The creators get paid much more (even if you have Youtube Premium). The payout of Nebula is like Spotify where Nebula (the company) takes 30% of money earned and then split the rest to the content creators based on watch time.
These 3 things are what I think make Nebula worth it for me, though it's fair if you don't think it's worth it to you (to each their own). Also, i don't how long ago you signed up but for me I think there's a good amount of content on Nebula (at least for the types of videos I watch)
but i mean, i don't have any use for youtube music so why am i paying for it