do they have a sizable community? honestly i just assumed it was almost exclusively used for image hosting.

Idk I think more people will stick around then won’t. But I don’t think it will be immediate. It will be a slower migration as Lemmy gets better and better and easier to use and there is less and less of a reason to go back to reddit for anything. I’ll only ever go there if I have to for some reason but over time those reasons will become less and less as the communities here grow.