Every day I watch videos on DTube and they are all in English.

Uhm, really?
In fact, I only knew about German DTubers so far.
Detlev is doing beer-related vlogs in German and English, diesimssuchties (German for "the SIMS addicts") is streaming her playing sessions, there are some other gamers who turned to DTube because Sempervideo, a big German tech Youtuber, attracted a lot of users, before he went back to Youtube because DTube had quite some technical issues in the first half of this year.
And of course the German nationalists love DTube. :/

But your idea is great and reasonable nonetheless. :)