Watching the scene, it looks like some creators recently moved back from Twitch to Youtube.

YouTube has an equivalent of that too: https://support.google.com/youtubegaming/answer/6304294?hl=e...

Twitch, unlike YouTube, has a ton of experience dealing with gamers. They have direct contact with their streamers, organize events (TwitchCon, esports events etc). The Amazon acquisition has been incredible to twitch so far, too. The Amazon Prime/Twitch Prime promotion has gotten streamers a ton of income and has been overwhelmingly welcomed by the twitch community.

YouTube, in the mean time, has a broken DMCA/content-id/copyright claim system - a constant source of complaints with no support channel to actually help.

I find it fascinating how, in YouTube competition, where Vimeo and DailyMotion are failing, Twitch is succeeding because they are simply focused on their strength and advantage, rather than try to just provide the same service with a nonexistant community. And now with Amazon behind them, they have the money to double down on it.

I'd be surprised if twitch didn't get strong armed into doing a similar DMCA content id copyright deal to stave off attacks from riaa and friends. The issue there is a legal one :/

Is Vimeo failing? I don't know much about it, but doesn't it have its own niche?

It does, same as DailyMotion. But it failed as a YouTube competitor.