If it was (more) moderated it would just be sterile, boring, and less true to reality. The entire point is to label areas with the most obviously applicable stereotype, and for that it's doing a great job.
I’m not sure why there’s such a high expectation of accuracy on something called “hood maps” that doesn’t use extensive moderation? Just move on if you don’t find it interesting or amusing.
I guess I didn't see a big "this is a joke" label on the site so evaluated it as I would any service purporting to provide maps - where accuracy is a P0.
There used to be something similar to this (was it called wikimapia?) back around 2008-2010 or so (maybe it's still around?) where people could up/down vote the tags and if the downvotes prevailed the tag would go away.