> Germans tend to have very good English skills, but if most of the people around you in the (game's) community are native German speakers why speak English and struggle along?

Because most is not the same as all.

Unfortunately, this is sort of a self fulfilling prophecy, as rswskg's original comment indicates. The fact that the community is German speaking means that non German speakers won't join (effectively restricting the pool of potential contributors by ~99%), and thus the German speakers won't have any reason to not speak German.