I wish there were a way to verify, when I encounter a camera that is pointed at a public place, that it's not feeding into some kind if nation wide person track

I wish there were a way to verify, when I encounter a camera that is pointed at a public place, that it's not feeding into some kind if nation wide person tracking system maintained by whatever security company, but is instead going to local storage with a retention period of < 1wk. I have a camera that can see the street which meets these requirements, and would definitely go through extra steps to inform passers-by that I've taken steps to keep data about them out of the cloud. I just don't know what those steps ought to be.