I only just found this sub and joined a couple of days ago. The only other sub I know that's active is r/zoo_irl.
Then there's this one on saidit.net, but it's not very active either :(
As for new members, it looks like the sole moderator hasn't been active for about 3 years. So I guess it's a "free for all" ¯_(ツ)_/¯