I think this idea is good. I remember seeing those domain names last year. At the time it seemed muddy and uncomfortable to me, since there was a whole scheme of Reddit ghost accounts posting, while I understood there were good intentions behind it, mirrored posts were flooding users' All feed to the point I started blocking a bunch of subs, and many admins defederated.

If we can promote the community first approach where the domain is the space for discussion to be held and stored, with users connecting from across the Fediverse, this would be excellent, a good alternative to massive centralized Lemmy servers. Collective ownership would ensure preservation of content if one or more go offline.