5 links have been added on this idea.
  1. This a good idea in theory, but many drones have major privacy and cybersecurity issues that can be more of a problem than a solution to your home security.

  2. SpaceX is now offering data connectivity support for autonomous security drones.
    https://www.teslarati.com/spacex-starlink-rdars-eagle-eye-security-system/

  3. This company has created the first fully autonomous home security drone system. It doesn’t come cheap, though.
    https://www.engadget.com/2020-01-07-sunflower-residential-security-drone.html