so we have english discord, forums, rules, patch notes, server, etc... but that doesnt really matter and here is why:
imagine, for a second: your whole game is in german. that means german text and german voice! Now imagine they have a question and ask in chat ... of course they ask in german. who could blame them?
How many people are active in the forums/discord? lets say 10% (and that's probably WAY too generous), that means 90% of people only ever come here to download the game once and then just play. So they only experience german for the majority of their time ingame and also ign