Basically any organization that does any attempt to analyze threats of any sort will have a need to collaborate with law enforcement.

Walmart does it for theft rings. Canonical does it for hacking threats targeting Ubuntu. Your bank does it for people trying to steal money.

The existence of a mailing list or something of that sort isn't particularly worrying. I don't think it's reasonable to expect a firewall between police departments and local businesses any more that it would be reasonable to expect one between PDs and local residents.

I would be alarmed if it turned out that Amazon was giving the Seattle PD direct, warrantless access to data about their consumers, or something like that. But there's no evidence presented here of anything particularly sketchy going on.

I think there’s lots of stuff in this space that is worth paying attention to, including for example just how complete a profile companies like Experian have assembled on US citizens, or Flock and LPR generally.

This just seems a lot of fluff with nothing substantial, hence a nothingburger.