The problem with that is just that video is so expensive. DTube solves the cost issue by not keeping your videos on for a long time. So on DTube if you want to keep your videos online you have to host them yourself with an IPFS node.

3Speak hosts your videos, but it costs them money every day you are putting videos on. Equality is important, but you can't ask others to pay your bills for you. If a content producer doesn't bring in more money than they cost 3Speak is not able to survive as a business.