I don't think Substack counts as "hosting [your] blogs independently".

> Are there any companies doing this for Videos as well?

There were a few; Vimeo, Dailymotion, Floatplane, Nebula... they all suffered the same fate though.

It's not hard to see why, either. Transcoding video is expensive. To deliver a YouTube-like experience you have to be certain that each user will be profitable somehow, something that is easy with ads but hard with any other model.