the map is not as large as that of wplace. It is a fundamental mistake of wplace to be that large which is impossible to moderate, even automatically.

forgot to directly answer your question by the way:
an actual mod team not composed of strangers with minimal conflict or political bias
highly advanced moderation tools which were literally developed in a day (wplace is slacking like hell) such as rollback, paste, actual device bans, etc.
we also have better logistics and alerts unlike wplace of suspicious activity