It doesn't have to be active like reddit right? Or even like Lemmy was around the blackouts? A community can remain active even without federating with lemmy.world. People can still sign up for Beehaw and see their posts from other instances (like feddit.uk or the canadian one).
I'm simply commenting about the sustainability and participation. It speaks for itself. I like the community there, but it has gotten less and less interesting as the participation has fallen. I don't see that changing.
Why don't you start an account there and help them out, or start an account on an instance that is federated with both if you prefer the community there? I personally disagree with their moderation and don't like the kind of users they approve of, so I'm happy seeing less of them around.
I prefer a lower rate of posts, it allows subscriptions to more niche communities. One of the worst things about Reddit was if you subscribed to any sub with more than 100000 members it would flood out any smaller subs, which were normally much better content wise.
Plus with a lower rate of posts, each one can receive more attention for the community. Comments can, and have, run for days on Lemmy, something that generally only happened in mega threads on Reddit.
We don't need growth for growths sake. It is part of the reason I find the arguments for federating with Threads so weak.