"As far as we know, he's an innocent man, still" I wouldn't say as far as we know. In the eyes of the law, he's innocent until proven guilty.
I can kind of see why YouTube would demonitize his channel. They haven't cancelled it so he still has the platform, they just aren't letting him make money from it now. It's true as Ras says that there are no doubt lots of YouTube posters with similar accusations against them who haven't been similarly punished.
I have mixed feelings about this Russell Brand issue. I used to follow and respect his pov, I didn't like the direction he was going in (while aware that lots of people feel as he does), I don't like women having to restrict their behaviour in order to avoid being assumed to be getting what they deserve when they are sexually assaulted, I don't like women being viewed as expendable sexual prey.
I can also see that people with bipolar disorder and/or addictions could feel targeted by what's happening to Brand.