To support decentralization and spread, should lemmy.world close registration at some point to prevent a performance overload due to too many users? Of course, if registration is disabled, there could be a hint placed somewhere near that from other instances you can interact with content on lemmy.world just like you had registered on it. There could be a link to join-lemmys instance overview.
I agree, I initially focused on Lemmy.world but as I understood the Fedverse better I shifted to a smaller instance. I think we need to let people get into Lemmy, and then people will naturally spread out.