To be clear, because the above comment was a little vague. You pay a fixed fee, like on Netflix or similar. I think it's $30 per year? I forget because they grandfather you into your old price any time they raise the cost.

Then they distribute the funds to the creators based partly on viewtime. (Roughly speaking: one share goes to the platform—some of which goes back to creators in the form of funding for Nebula Originals—one share goes to the creator whose signup link you signed up with, and one share goes to multiple creators based on watchtime. I'm not sure if those shares are equal.) It's sort of a creator-owned co-op type structure.

Most of the stuff on there is also available on YouTube, with the Nebula version just being ad-free and sometimes uploaded a day or a week earlier. Then some stuff has little extra bonus content on Nebula. And then there are Nebula-funded Originals, most of which are exclusively on Nebula, but some of which are shared to YouTube for marketing purposes. You can explore what content is available on the platform without having to sign up, at nebula.tv, to get a sense for it.

There's !nebula@lemmy.world if you're interested in more. Not that that's super active.