A year or two ago when I was doing some searching in Maps for trails to hike in Hawaii, I noticed that if a trail didn't have an "official" website i.e. pointing to a local government page, in several cases a certain photographer had put his website into that spot. And later I discovered he had done this not only in Hawaii but several trails in Utah as well. It would not surprise me if he's hit up hundreds of trails for free advertising via Google's lack of vetting.

I reported it, of course, (as someone else mentioned, Suggest an Edit) and they got changed, but I haven't checked to see if he changed them back.