none of the players on lev play the game in their mother tongue
Japan is like the only country that uses japanese with around 125 million speakers almost all of them being in Japan
Learning mandarin for example lets you communicate to more than a billion people compared to japanese's 125 million
Italian is a similar case but learning italian opens you gates to learn spanish french portuguese and romanian easily aswell, which then adds up to over a billion speakers
Languages like russian are useful for space, latin is useful for medicine and english is useful for everything but for what exactly is japanese useful for?