I've sent in corrections to Apple Maps in Portugal (shopping mall is 1km away from the location on Apple Maps) and Canada (speed camera does not exist). Both were taken care of within a couple of days.

It took them two years to update my address.

but then again Apple Maps seems (certainly here in London) to be absolutely full of geofraud entries and out of date slop, such as small businesses with linked websites that have been shuttered for years, and strange businesses located in the middle of playing fields, parks and lakes.