We outlined why we defederated from lemmy.org in February's Monthly Meta.

The fuck cars community is hosted on lemmy.ml, which we are federated with. Lemmy.org is an entirely separate small instance that does not have an active admin or moderation, and happens to have a very similar name to lemmy.ml. The admin that is there is essentially a bot that automatically posts crypto and tech-bro AI stuff, and they could not be reached about the other issues related to their instance, making defederation the only option.