Google Play isn't really behind this.
They're simply providing the venue through which it can be downloaded.
After all the complaints to Google, and threats of legal action in the replies to to the app, they had left it up the last I saw. That could lead to anyone being targeted for a robbery, assault, or have their home vandalized. If Google was warned, beforehand, then they can be brought in on the suit for damages. You know yourself how easy it is to bring suit against anyone, but making it stick is something else. However, I think the state can seek an injunction on this, forcing it to be pulled. Like I mentioned, SCOTUS said there was a limit to 1st Amendment rights, if it caused a crime. Especially right now, after a certain court case ended yesterday, and we have a bunch of lunatics that might act out over it.
I know some elderly gentlemen who have some pretty good size collections, and I doubt they could fight off someone, even with a gun, to be honest, and I would hate to see something happen to them, or myself, over this.
Anyone can make a complaint to their states Attorney General, and it is up to them to investigate this, and do something with it, if it has a chance of causing crime against a citizen of the state, and we don't have to be the ones to bring suit.
Here is the Washington Times article on it for any interested:
http://communities.washingtontimes.com/neighborhood/citizen-warrior/2013/jul/9/new-android-app-tracks-gun-owners-addresses/