The Xiaomi M365 electric scooters is popular with ride-sharing companies such as Bird in the US. They can hire out such vehicles online thanks to the ability to remotely lock rental units as and when they need to. The research group Zimperium has claimed to be able to hi-jack this mechanism due to vulnerabilities found in Xiaomi's Bluetooth authentication procedure for the M365.
https://www.notebookcheck.net/Security-researchers-claim-to-have-hacked-and-remotely-controlled-Xiaomi-electric-scooters.406821.0.html