English is a language most if not all TB players can at least understand somewhat. Definitely all ES members which host these events and are in charge of moderating the chat. The problem with russian is that unless we have a russian speaking ES member hosting the server, they cannot see if you are saying anything meaningless and/or breaking chat rules. This is why some hosts like for the chat to be English only. Some hosts do allow other languages in chat but that does make the server prone to harrasment shielded by a language barrier. So most ES, instead of allowing russian and then when somebody complains about something said in russian and having to go through translating what was said and figuring out if it was in any way rule breaking, just say that the chat should be kept English only. This is in no way an attack on any languages or cultures, rather a way to lessen the potential of rule breaking getting past them