I've submitted a correction for an illegal turn instruction twice on Google maps. No reply. But my other corrections have been accepted.
I've added sidewalk vendors to the map with names like "coconut cakes lady," and had them approved instantly.
I've also tried to rename streets, including the news article about the name change, and had them unceremoniously ignored. Same for adding a new bar to the map with a photo of the menu, even though other places I've added have had hundreds of thousands of views.
There doesn't seem to be an underlying system. There's a famous traffic stop in Muine, Vietnam listed as something like "social security office." The photos are all of the traffic stop. The reviews are about the traffic stop. If you run the name on Maps through translate, it comes back "traffic stop." I've tried repeatedly changing the category to "traffic police" and been silently denied.
There's a bar in downtown SF at the wrong address. Comments are about the address being wrong. There's even a photo that says "our address on Maps is wrong." Try to fix it in Maps? Denied.
https://www.gislounge.com/map-traps-intentional-mapping-erro...
In the case of my repeated Uber map correction attempt, I suspect that my correction isn't prioritized because of two factors: first, the turn which Uber Maps suggests, while both illegal and very dangerous, is not impossible (it's an illegal left turn accomplished by making a U-Turn around an island designed to prevent left turns). So, they probably see enough volume of "driver completed route as suggested" data signals to ignore any "but it's illegal and dangerous" complaints, a classic problem with "data driven" systems. And, Uber don't seem to have a real process for riders to submit mapping corrections, only drivers, so my request is unlikely to ever be routed to the correct queue to begin with.