Lots of prominent streamers are getting banned for things like live-streaming movies and TV shows (violating some copyright). These are temporary bans (like 3 days) and the streamers are already so rich and popular they really don’t need to stream anyways.
This is actually really good for Hikaru because he gets his name on more news and it makes Twitch look stupid.
The policy may make Twitch look stupid, but it's for a pretty good reason - people would get banned, and then just play multiplayer (with voice or even video chat) with their friends who were also streaming. This effectively allowed them to continue to stream and interact with their audience despite their 'ban.'
Agreed that people often get banned on purpose as a way of keeping their name in the news.
Judging from your comment, i believe you think he has the moral high ground.
The ban itself doesn't need to be justified to say that he can (and most certainly will) profit from this ban.
The next logical step is to think about streamers provoking (short) bans where twitch looks dumb and hacker news discusses them when it normally wouldn't. Was that the case here? No idea. Is it especially unlikely, I don't think so.