Or the game is completely reliant on a common language and communication.
“English only” is pretty common on things like Twitch chat for the simple reason that a person can’t be expected to know every language on the planet and moderating it quickly becomes impossible.
This is a game that is completely dependent on people speaking a common language. If you don’t speak English and instead start speaking in Romanian, then you’re effectively throwing the game for everyone on your team. Not to mention for all anyone knows you could be espousing the virtues of National Socialism and the dangers of The Jew.
It’s not remotely racism, it’s reality. You speak the language of the community, until such time as there are different servers for different languages (if that would ever happen), because… again… the entire game is based on communication. If you literally refuse to or can’t communicate with anyone else then you’re trolling 15 other people.