If this is true the only thing that’s going to be killed by the kill switch is Linux, and MSFT will be through the roof tomorrow.
Linux, the backbone of the Internet. The OS that runs the switches and routers that MSFT uses to download patches and updates. The OS that runs the DNS servers on the Internet, so you can get to MSFT's website.
Remove MSFT from the Internet, and what happens to their stock?
I don’t believe there is a “kill switch”. They can’t remotely change the kernel that is on any Linux computer.
If in doubt, don’t accept any kernel updates.