The main area where DTube needs development is in my opinion the video IPFS storage/delivery side, and I don't know much about that at the moment, so wouldn't be much help there. The actual front-end code is not really open source, as the code is obfuscated.
As transisto says, this project is a bit different too. It will become clearer as development progresses, but it will hopefully also have some interesting features that YouTube and DTube don't have.