Honestly, I posted about livestreaming earlier. I would think it's against ToS for commercial use/commercial advertisement if you're promoting something - like one's art - because there's really no way to tell if one is actually getting money by promoting themselves for views... at the same time, I'm not even sure if earning money is the end all be all of what's allowed and what isn't for advertisement/self-promotion. But I don't know. It'd be nice if the ToS could be clarified about things regarding that.