I’m not sure why apple wont capitalize on their huge user base and allow map users to write their own reviews. It would be much better than being in bed with Yelp.

Because they would need to put together a moderator team, and then 2 years from now find some way to monetize it to justify the products existence to the bean counters. The suck at moderating reviews for products they already have reviews for (apps, podcasts, etc) why would they want to add another failure to that list?