Re: US ban is little to do with security
Can you name the companies that benefit from this protectionism and where they are based? It goes a long way towards validating your point.
If you are unsure, have a look at who currently holds 5G patents.
The security aspect is around "what if China has a falling out with the rest of the world, how much disruption would be caused if a lack of support/licencing resulted in mobile networks being unavailable?"