They didn't create anything, streamers and "Youtubers" would have existed with or without Youtube. They'd exist on twitch and other services if Youtube went down. Youtube was just at the right place at the right time and there's a lot more to youtube than e-celebs.

>It was only a matter of time until one of those furious victims took up a gun to get revenge.

Damn, that's a pretty fatalist viewpoint and an odd way to state that. "We updated the ToS, somebody went and shot a few of our employees, oh well, what can we do?". It's very tempting to let the discussion stray into "Americans and gun violence" at this point but I guess I'll stop there.