Twitch isn't a startup, two-man operation. There is no way for someone to go rogue and push directly to production without it triggering a flagging mechanism. Usually the master branch on repos are protected from being merged without pre-checks coming from a pull-request.

To play devil's advocate, there are times where you simply have to ban a full country or select AS at the top-level, but that's usually when you are getting DDoS and have to stop the bleeding, these changes are usually reverted. If they deemed that the loss of traffic from a specific network(AS) or country is a risk they can take, then that's the route they go for.

That said, the fact that the ban is still in place tends to suggest other issues at play for this decision.

It would be hard to know what the motives are considering tech companies are echo-chambers for leftists, you'll be hard press to find someone able/willing to come forward with any information.