I completely understand them not wanting their platform to be used to make political statements. This isn't like the NBA situation where Morey used a private social media account to show support for his private political opiniona. This was a platform owned by Blizzard with a very specific content focus.
But banning Blitzchung for any amount of time was just dumb. They have the right to respond that way, but it's still a dumb response.
They should have made a public statement following the incident that went something like this:
"We encourage players and community members to express themselves. However, our tournament coverage is a platform for Blizzard e-sports content only. Any future use of the platform to express personal political opinions on sensitive subject matter without Blizzard's express conscent will be met with punative action."
Follow that up with a description of what that punative action would look like.
I can't imagine any backlash to that. Many people would be unhappy, but I doubt there would be protests or letters from congress.
Blizzard made a mistake and they are refusing to learn from it. Now they get to deal with the fallout.