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KBin Stable Diffusion Channel
(kbin.social)
Discuss matters related to our favourite AI Art generation technology
You'd have to talk to the mods. But I think a general issue is that cool pictures appeal to the widest range of users, so an image-based server becomes popular. And people want their posts to be seen, so they post to where they think they'll get the most views.
The only way your suggestion could work, I think, is if both servers strictly allow only one type of content.