Nebula focuses mostly on 7-50min, edited content. That is to say, not shorts and no let’s plays. They have some solid originals, like the Battle of Britain series, however most of their content is also available on youtube. What most creators do is offer the ad free version on Nebula (ie no in-video ad-reads), and Nebula doesn’t add ads themselves. Many creators will also create supplemental videos that aren’t available elsewhere that go into more detail on one part of the prior story; something LowSpecGamer does quite a bit.
On the negative side, because the content is all edited (ie, not things like lets play) and there are less creators overall, you can’t sit down and watch Nebula all day every day like you can youtube. Also, as mentioned earlier, much of the content is also available on youtube.
I personally like it and happy to support creators I like. The extra content is solid and it’s nice creators are rewarded for making quality content.
Glad to see more handhelds picking up Steam OS! So many portable competitors have been hampered by their OS sucking down limited resources while providing an inferior UI and UX.