As the nuclear option, the USG could simply force them to stop doing business in the US. That would effectively put them out of business and would never happen.
Yes but all of their designers, developers, etc, are all in the US. Note that all Apple stuff says, "Designed in California". If all of your non-manufacturing is shut down, the company is shut down. I think you failed to see this point.
You are right on both points. They do say that (I see now that my laptop says "designed by Apple in California") and yes, I did not imagine that all of their engineers are in the US.
I would still guess that they would try to move to another country rather than shutting down. I admit that it would be hard if not impossible.
