I was never on Reddit so I wouldn't know, but I just don't think there's enough content to fill multiple communities. I might very well be wrong though
I'm just worried that this would lead to 3 dead communities instead of one thriving one. People forget that communities exist, if they don't regularly see posts in their feed. It might also add a lot of moderating, trying to explain users where to actually post their image.
But I don't know, maybe my worries are unwarranted.
It's neat that Linux has the ability to do this, but I honestly can't think of a good usecase for this. I think this is more confusing than it is useful