There really is no comparison, Tildes has a few hundred to thousand active people (looks like about 20 posts a day… across the entire site), and is run by a single guy with very particular ideas about what people are allowed to say and do on his site.
Lemmy meanwhile has roughly 50k users and I would guess hundreds to thousands of posts per day, even if not millions like Reddit that allows more niches to develop.
According to the comments, some people did!