It can be all of that and more. And in my case, if someone breaks into your house and steals your stuff, the police will not care because you don't have any evidence. And then your insurance doesn't believe you either and threatens to drop you.
And if someone is trespassing and about to commit a crime, you can be notified (yes even as an individual, with your own private self-hosted solutions even) immediately so that you can call police or deal with it however you want, especially if you're not home.
And if someone is trespassing and about to commit a crime, you can be notified (yes even as an individual, with your own private self-hosted solutions even) immediately so that you can call police or deal with it however you want, especially if you're not home.