Lol iPhone users. Because of how bad the UI is and how it's designed to keep you leaking data, most iPhone users never turn off their radios like Bluetooth when not using it.
You combined with shoddily made products fast tracked to market for cheap like this Xiaomi car, it's a recipe for mass data theft or unintended connections like this case.
Proliferation of iPhones has to be mankind's greatest behavioural hack to relinquish personal rights. And you pay a premium for it!