I’m fairly certain they crowdsource the info. Their initial scan gives them a baseline, then they wait until x number of reports all conferring with each other to have the system either kick it up for review, or make the change automatically if possible.

It took YEARS for me to get Google Maps to correct the location of a local bus stop. It showed up on the wrong street, which screwed up walking directions. They finally fixed it when I submitted a photo of the bus stop along with my report, even though it’s exactly what you see if you check the recently updated street view in the exact location I had been submitting error reports. 🤷‍♂️

In the android app you can just hold on a part of the map and pull the menu up and tap "report a problem".