I'd rather see more of a curator role that approves worlds in the future, like popular world creators get a choice to vote worlds to be approved/ accept worlds in the future, but as of right now Community Labs type of worlds will waste so much space and look horrible and low quality for the game to be honest.
I personally don't want to see memeavatarworld v1, memeworld2, memworld4, bigmemz1, etc (type of names) in the list.
It obviously has some real use case for worlds, but I really think they should just go through the publication system for now, and leave testing content to private worlds.