Sometimes it's public entities, like city councils, or police departments. Othertimes, it's privately owned business, like Lowes, HomeDepot, apartment complexes, or even "communities" like HOAs. The point is that Flock is a private business, and only government affiliated when and where the government decides to do business with them.
This is in contrast to say, traffic cameras, owned by state DoTs, which are public property and exist on public infrastructure.