I should clarify that in my original post I'm not meaning to imply that all of this content is depressing, or that YouTube bassist are depressing.
It really just this particular video, as I think that the playing in it is really poor. All of these solos can be played on bass, but he does a really bad job of it in my opinion.
As has been said he had found his audience and is certainly entertaining them, and presumably making a very nice living for himself.