alt Hacker NewsDave Jones from the EEVBlog does this - he cross posts to his own site and to many smaller video hosting sites. But if I remember correctly he has said in the past that almost all his viewership comes from YouTube. Unfortunately for long-form videos in English YouTube seems to be the only game in town in terms of discoverability.
While you're tiny, you need discoverability a lot. But even if YouTube bans you and deletes all your videos, you lose relatively little.
The bigger you are, the more well-known, the larger is your following, and the more the whole enterprise is the source of your livelihood, the more you may need to hedge your bets.