Seconding this. I've been subscribed to Nebula for a couple years, as I watch a lot of video essayists on Youtube and like half of them are on Nebula. In addition to ad-free viewing, you also get:

* No in-video sponsor segments

* Exclusive videos (including some creators and series that upload primarily to Nebula)

* Early access to some videos

* Uncensored videos, as Nebula does not have the automatic content or copyright enforcement systems that Youtube has

* A decent TV app (at least on Roku), so I can watch ad-free on the TV without paying for Youtube premium

All for a much cheaper price then Youtube Premium ($60 annually vs $160, with frequent promo offers). If you already watch a lot of Youtube channels that are on Nebula, I'd highly recommend it.