"Part of Flock’s proprietary tech determines the make and model of the vehicle and also notes if there are bumper stickers, bike racks, any other unique markings that would help identify that vehicle."

I have always avoided bumper stickers and custom license plates for more anonymity. I have a ham radio license and decided not to get a license plate with my callsign on it because people could easily Google that and find out my name and address. I had always just thought about other drivers in these cases, not law enforcment surveillance!