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Twitch is free and quite popular.

Everyone hangs out on Daily Motion, Vimeo, Cinnamon, D.Tube, and PeerTube all the time. Right?

twitch isn't a video hosting service. it's a streaming service

...with on-demand replays of previously streamed content.

...which expire in two weeks (or 60 days if you are rich) so only few minutes of highlights remain.

Which everyone are you talking about? 99% of youtube users probably never heard of those services.