Well, I'm not totally informed but from my understand D-Tube is still a bit unknown, it's got the block-chain setup for decentralization. It appears to only reliably take MP4 videos. There isn't any censorship, but it uses the same "New, Hot, Trending" system of Steemit and Uses Steem currency for payment. Upvotes function the same as on Steemit, in that you get direct monetization. It's clearly still in the development phase and doesn't have a huge number of users yet. So while you could make money off it, a full transition for most "Youtubers" isn't really viable, yet.
I recommend posting a few videos on it to see what you think, but don't expect a gigantic burst in revenue. You use your steemit account on D-Tube as well, so you technically already have an account. Just go on and post some videos. Good luck.
A video by WAM, about D-tube.