[iagovar]

> The Spanish police, concerned citizenry, etc. can use the app just as much as anyone else, to prevent things from getting out of hand

They can't. The app uses some kind of location data to silo information. So for example if they want to make an action in Tarragona, people from Barcelona is not going to know about it.

It is likely, seeing some threads of people who have analyzed the application, that the administrators, or whoever is behind it, will be able to know how many people are available in a particular location, and isolate that information in a kind of opsec.

[saagarjha]

Can't you spoof location data?

[iagovar]

I guess so, I didn't do the analysis, but I'm pretty sure the guys who did the app already thought about that possibility.