multi-cultural MMO is possible, matter is how mature and smart the community is.
for example, gw2, has one of the best communities even today, where BR, Spanish, and English speaking people can join up to play the game, they also have a map chat system, and its known that if a person starts to spam in any language, they do the smart and mature action in their life, BLOCK the spammer, but it seems is like people love to click the bait and act dumb, but well that’s how it is, i would suggest to simple block the users that you find annoying ASAP and keep the cool, the other day in this game some latinos started to spam their “esto se va a descontrolar” crap (note i am a Mexican), so, block and keep playing the game, but others were like “fuuuuuuuuuck BR spam!” and i was like “ignorant fool that’s spanish” and ignored it, and kept playing, i personally never understand the rage in a game, it is a game for christ out loud… there are methods to get rid the toxicity in the game but yet they have to rage just for what? is annoying others fun?