We have a doorbell cam plus a floodlight cam that covers our driveway. I've also installed on both sides of the house and backyard, motion sensor, solar powered lights. I've found dumped garbage, and a stolen bike which lead me to install the solar lights.
Had a fuzzy looking guy come walking up my driveway once. He spotted my camera as he was walking up, then turned around and took off. So yeah, I think they help out in the long run.
@Paco Dennis you can go to YouTube and do a search to find a bunch of information. The products seem to be getting better along with the price. I just upgraded my doorbell cam.