Patreon and Twitch do require your users to fund you mostly as the ad-revenue on Twitch is tiny, so as long as you have an fanbase that has disposable income and is engaged they are options. You'll probably still need to host your videos on YouTube for the discover-ability aspect and Twitch will only allow some kinds of content and not store it easily (or make it easy for people to find when you're not streaming).
Creators could go to DailyMotion or Vimeo right now, but if the advertisers aren't willing to pay, the money isn't going to come rolling in. Advertisers call the shots so I find it hard to just point at YouTube and blame them for everything. If they don't err on the side of caution, then everyone loses advertising. They're not a public company providing a utility. They have to side with those that are paying the bills.
Since they can't fully police the several hundreds of hours of videos per second that gets uploaded, they really should try and categorise them as Teen, mature and Restricted and let advertisers opt into those categories rather than just Normal and Restricted though.