The Twitter account posting this seems a bit unhinged, with the snitch tagging of everyone from th ADL to the ACLU and the weird speculation about a "purple haired" person. I'm not inclined to take their description of the scope of the block at face value; is there a better source?
(Also, Twitch is within their rights to decide in which countries they offer their service, and there could be any number of reasons for that kind of decision.)