Last I heard, Trapster was forced to remove DUI checkpoints to stay on the app store. That was after attempts to rule it illegal in court failed. Same result. Crowdsourced DUI checkpoint apps are effectively gone if the stores don't have them. If only a few sideloaders have them, then there's no crowd to source.
This would work in a similar manner, but would expose the cops' fake cell towers. I fully expect this to suffer a similar fate.
That is not to say I don't like the project. I commented just so I could find it again in the future :)