niche online communities have a lot of trans people overall
I feel like they are overrepresented because people tend to be more themselves online if they are anonymous. whereas you might not even notice a trans person irl unless they tell you
another theory is that trans people attract other trans players because they recognize and sympathize with each other. similar to how people of the same nationalities, cultures, or any other character trait group up.
idk, there's tons of reasons, ask them