Re: I don't understand
I know as much as you do about the game, but I think I guessed the problem. It would be expensive to download and analyse detailed maps of all the urban areas around the world. Instead of telling public from private spaces they probably just track gamers movements even when they are not playing and rely on the with big data tool, probably privacy is not one of their main concern.
If I guessed right the difference between the US and the UK would be the fences. It's not so easy to get into the private area of a housing complex.