Thanks for the advice. Do you have anything specific you're concerned about?
The reason uploads aren't open to the public yet is probably cost. There's a reason there aren't thousands of different video hosting sites out there (and it's cost). It's the same reason that DTube videos disappear after 2-3 weeks.
3Speak does hope to be able to fully compete with YouTube, and soon. It's a lofty goal, and I hope they manage to do it. There are only a few other free video hosting sites out there, and they are ALL heavily censored (and have other drawbacks). 3Speak is well coded (from what I can tell), offers support for users, and even upvotes comments on video posts (as you've just noticed). I'm as skeptical as the next guy, and I never hitch my wagon too tightly to anybody, but let me know if I'm missing something!