In both cases while on a base human level it FEELS wrong, if you follow the $$ end of the day the broadcast is the product they're selling to advertisers. Adding any sort of political/divisive messaging could be easily kill those deals - makes sense given the finances. You're attacking their primary income stream, of course they're gonna come at you hard.
The player is not owed any platform by participating in this Blizzard event. If they banned him for comments made on his own social media outside of the event it would be a different story.
To be clear I'm not defending Blizzard, just explaining why most broadcast orgs will react similarly.
It is what it is, until the advertising based model of entertainment changes it'll continue to be this way.