>>15212021RTV is about people you have no emotional connection to, and also staged. It is fun because you have no emotional stake in their wellbeing. But vtubing is not RTV, and treating it as such betrays a very shallow investment in the hobby.
Schadenfreude is not necessarily to the detriment of someone else. You can be gleeful about one of your friends having to suck it, knowing he will be fine.
If by Schadenfreude you mean vengefulness, that is not mindless fun. Vengefulness is deriving glee from someones failures because it hurts you to see them succeed, and you are better off not feeling that way in the first place.