Even without care refresh, DJI drones need to bind to a registered account and login each flight to fly fully, even if its 5 years old and out of care refresh and warranty. No binding = no flying more than 30 metres horiz and / or vert. Its about logging who's flying the drone.
In Australia, in the event of a serious accident, the accident investigation people can take the carcass of the drone to DJI and they can tell from drone and gimbal # numbers the account that the drone was being flown under.
Ask this guy.
A man has been hit with a $1000 fine after he flew a drone into one of Australia's tallest skyscrapers. The man was flying the drone over Melbourne when it hit the Eureka Tower.
www.dailymail.co.uk