I would assume the database are generated out of used reports, the App i use is 100 % user driven, so when you pass a place there a speed van are set up or they stand there with laser guns in hand, you just press the add sped checkpoint in the app, you can also add other things like road works - traffic jam ASO, but those require more button clicks on the phone.
The app are free but do have a paid for premium version with more features i suppose, you can also buy little hardware devises that are Bluetooth, but i do not know if they are relying on the phone or what to get updates.
The speed vans here usually change location every few hours.
Fixed speed cameras i assume are fixed or at least dont get moved around a lot.
There are also the "issue" of ANPG cameras, which can pretty much track you where you drive, more and more of those are going up here in Denmark, though they say for traffic counting reasons, i just wonder why not do traffic counting using one of the much cheaper ways,,,, why use license plate reading cameras,,,,, you can also count traffic ( vehicle / types / humans with just regular CCTV cameras )
Access to all of the GPS systems are free, but as a mere mortal you do not get the super high accuracy, which in some cases are down to mere mm VS the Meters you get normally.
The European Galileo System, if you could make a guided missile small enough and have top tier access, you could shoot a person with that and send the missile thru the old fashioned keyhole in the front door.
