This was a big problem in house wiring years ago, why is it not still a risk, seems you see in the news a lot more stories about EV's burning up than gas cars - - even with copper wiring ...
Automotive industry people clam new special fastening methods and connectors with anti oxidant greases., but is the public being "setup" as beta testers ?
It is widely known that as electricity flows through and heats up the wires, aluminum expands. As it cools, it contracts. Over time, these temperature changes cause the wire to loosen at connection points, unless they are spring loaded or other special techniques.