Are there communities, free software/open source or otherwise, using Lemmy as their forum software?

Nowadays, many use Discourse, some are on Zulip, and I just don't care about the Discord ones. Would Lenmy not fit the same purposes? It is federated and easier to participate in, like mailing lists - no need to sign up per forum. Matrix is too, but it doesn't seem to be made for long-form writing.

I believe Discourse was designed based on experience with community dynamics, and Zulip is well-designed too. Would something with federated participation like Lemmy not work as well?