Right now there is no real advantage of uploading there instead of uploading to YouTube and just embedding it.

Let's say it progressed and the features on the site got super good and was far superior to Steemit then it would maybe make sense to just be interfacing with the STEEM blockchain from there. Honesty if a group decided to take that concept and start their own clone of STEEM that started with a more fair distribution I think it could gain decent traction.