ALPRs
As for the cameras, they're all over the place.
There is another method of deploying them. You know those trailers they use for temporary road signs and construction work lights? Well they use those for ALPRs too. I noticed several pop up while the FIFA world cup was in town. They are the orange trailers with the small box like a road sign, but instead of a sign there is a mast with an object at the top. These can be towed anywhere and assembled in about an hour. The ones I saw were off the side of the interstate highways, scattered around town.
For plate recognition they snap a picture of every vehicle that drives past them. They send those pictures to their database and AI generates metadata for them. Including plate number, make, model, and color of the vehicle. And any distinguishing characteristics like stickers, dents, or scratches. So they absolutely know about your Fuck Flock sticker.
As far as abuse, Flock is taking a hands off approach on access. They sell access to agencies and log the queries that get run, likely because they bill on a per query basis. But they state out right that it is up to the client to control who can run queries and what policies should be followed. And they don't just sell to government agencies. I've see stories about HOAs (Home Owner Associations) installing Flock cameras.