I see that Dtube is a great idea, it can be very sustainable. The current content of the DTube platform (mostly + 98%) does not contain copyright.

Now, it's time (I think) to release the code, and so help you. This project does not deserve to die.

Youtube, currently, is undergoing changes in monetization, that would help enough that Dtube grows a lot. Honestly, I myself would start creating content (I'm new to Steem) for its platform and even invite the communities and forums of my country to do it.