The Nextdoor analogy is even more apt because it's kind of notorious for being used by people to complain about all sorts of ridiculous things that don't deserve attention
If only there were a way to address people doing destructive or harmful things.
We could even make it reachable using a telephone, with a very convenient to dial, short, easily remembered number sequence.
I don't know about you, but in my area, NextDoor is mostly "I saw non-white errrrr I mean, uh, 'someone who doesn't look like they belong here' person in my neighborhood" and general witch-hunting any time it's mentioned someone gets arrested for
Also, we have concepts like "innocent until proven guilty in a court of law" for a reason. Corporatizing law enforcement is not a good thing.
If Amazon wants to work with the PD they can show up to a community relations meeting like everyone else?
The irony is that curbing this "private intelligence network" would require infringing on the free speech of private people.
When the "shopkeepers" are billion dollar corporations, and several levels of law enforcement (including national ones like immigration officials) are also on the network, I think it makes sense for the level of scrutiny to be a bit higher than your hypothetical