I'd like to run a #kbin or #lemmy instance specifically to make fediverse friendly communities based on some niche subreddits I interact with.
I would only allow posting in the communities, but no signups for the instance itself; people can simply sign up elsewhere and comment as needed through federation.
Does this sound like a good idea? Is this viable/would it work? Is there a better way? Should I make those communities on existing instances (.ml is overloaded tho)?