Restream.io broadcasts to 30 different platforms at once, including Twitch from your list. Broadcasting on multiple platforms at once is definitely a way to fight back against censorship, it makes it orders of magnitude harder for The Powers That Shouldn't Be to silence you completely.

It's possible to configure Restream to output to Facebook, Vimeo, dLive, and others via RMTP custom platform. You have to pay for this but it's not much.Restream also has a URL chat feature which integrates chat from the different platforms into a single feed.

If you sign up for Vimeo Pro Live you can automatically stream to Facebook Live too from their interface.

I would add to your list:

Periscope (Twitter)
UStream (now IBM Cloud Video)
Livestream.com