This would have applications for police for detecting unauthorized activities such as smuggling or movements of agriculture planes (chemical spraying) on private airfields. Assuming the planes are >25m.
It also rules out most military planes! Including the B21 Raider stealth bomber and F35.
So that limits it pretty much exclusively to large cargo aircraft, large passenger aircraft, and large military transport aircraft.
This is not terribly useful for anything other than tracking military logistics but only the US does that by planes in any significant manner.
That >25m is a giant limit they just kind of walk right past.