Yes, that is the website for Hive-Tube. HiveCast (if we can get proposal #274 voted in) brings a lot more user engagement to Hive.
RE: "paid once" ...
When you post a video, blog, photo, anything to the Hive blockchain, that post can only get upvoted/downvoted for up to 6.5 days. If the blockchain could pay you forever, then there would need to be unlimited funds in the pool to pay you with, or, endless ads or other money coming in to keep those funds replenished.
However, if you reply to people when they make a comment on your video, or post, or image or whatever, you can get upvoted again to keep the rewards flowing from that original post. See? It pays to not just endlessly post, but rather to post quality content that encourages user engagement. 💪