The obsession many have developed with Flock and it is exactly than an obsession, because literally all thinking people do about it have little or nothing to do with Flock itself is really counter productive.
There are real privacy questions here. Should police have access to ALPR aggregators and as a subscription service really isn't one of them.
The technology to recognize a plate is getting better and better pretty soon there will be zero need for a purpose built camera, computer vision will identify a vehicle plate from a photo taken at any angle at any level of clarity a human could and then some. There are plenty of nice images complete with exif tags for date time precise location all over social media to scrape, there plenty of things like RING cameras, and even if its not Amazon specifically other companies will share their data, that do residential and commercial surveillance. It will not be long before gait + face + other recognition technologies are sufficient to relatively positively track individuals and vehicles, coupled with AI to correlate these uniqued tracks with a few really positive identifications say from ALPR, and anyone with enough cash is going to be able to construct a very detailed picture of everywhere a person or vehicle has been.
Policing and potential abuse is just one angle, and it isn't the angle I'd even worry about for every case of abuse there are at least some kidnapped children returned home, some property recovered, some criminals off the street, and remember those people arrested rightly or wrongly still get a trial - well unless they act like anti-society loonatices and try to combat law enforcement...they yes they might get shot.
Personally I think we should care about privacy. Police abuse though quite honestly seems like less of an issue for most people, I'd be more worried if my HR department suddenly got to start evaluating if I went the bars or the horse track to often for their taste. Maybe your homeowners company raises your rates because they see how frequently you visit the DIY warehouse store?
There really are only three (3) real solutions here and two (2) sorta practicle ones.
1) Eliminate all requirements to display unique identifiers in public. IE No more license plate numbers, just a state registration tag except on public vehicles (IE police, fire, medical, municipal). Non-government employers should be strictly prohibited from requiring employees ware any identification that shows and employee number or name when they are not on the employees own premises. You could still say you must where have on your "I am Steve's HVAC employee badge" when you visit a client, it just can't say you are "Jim Smith, #192".
2) Restrict photography, that captures individuals or vehicles on public property - ie streets. Carve outs would need to exist for places identified as parks etc where people would simply have the expectation of being photographed at least incidentally to others taking their family vacation photos etc. Yes this will change the media landscape we are used to in a huge way. We will have to go back to accepting witness description of evens in our daily news feeds.
3) Try to legally control the aggregation and sale of individualized marketing data. This is the one I actually don't think is reasonably. I think you have to tackle the production of the data on the supply side because it only becomes marketing data when it is used for marketing, before that it is someones security footage, university research projection, or news gathering operation. Trying to imagine and describe what is legally permissible to do with collected images from any number of sources after the fact with lots of actors motivated to try and get around it, is probably hopeless. The law just isn't that plastic.
