There are a few vendors out there who sell the data they collect, and then sell search capabilities to law enforcement agencies, repo firms, bounty hunters, etc.
These camera systems are usually installed on civilian cars and those people just drive around all day on 10 hours shifts around their territory. They aren't looking for people, only collecting the data. Some of them get rights to add cameras to signs in front of shopping centers on busy streets. Some have even illegally placed them next to red light cameras that use an open wi-fi to upload the data back to their database. Its the wild west for some of these guys, but they make almost no money once you account for the cost of the cameras, cost of staff to drive around, etc.
These camera systems are usually installed on civilian cars and those people just drive around all day on 10 hours shifts around their territory. They aren't looking for people, only collecting the data. Some of them get rights to add cameras to signs in front of shopping centers on busy streets. Some have even illegally placed them next to red light cameras that use an open wi-fi to upload the data back to their database. Its the wild west for some of these guys, but they make almost no money once you account for the cost of the cameras, cost of staff to drive around, etc.