tension on kernel mailing lists continues to grow as a Linux Foundation board member finally replies with a "summary of the legal advice the kernel is operating under" re: enforcing US sanctions
Moreover, we have to remove any maintainers who come from the following countries or regions, as they are listed in Countries of Particular Concern and are subject to impending sanctions:
Burma, People’s Republic of China, Cuba, Eritrea, Iran, the Democratic People’s Republic of Korea, Nicaragua, Pakistan, Russia, Saudi Arabia, Tajikistan, and Turkmenistan.
Algeria, Azerbaijan, the Central African Republic, Comoros, and Vietnam.
For People’s Republic of China, there are about 500 entities that are on the U.S. OFAC SDN / non-SDN lists, especially HUAWEI
Some patches are linked where it looks like they're trying to remove vast swathes of Chinese maintainers as well. If they insist with being a US lapdog like this then Linux kernel (as maintained by the Foundation/Torvalds etc) is fucking dead, no contest.
So long as the foundation and the official "owners" of the kernel are US based, then the real answer is "because it's the law". Despite the fact the kernel is maintained and used throughout the globe, other countries' laws are entirely irrelevant, but people who employed in a country are typically held to its laws.
The real mistake was having a registered company in the US that they're unable to realistically move abroad.
In a world with sense, someone vaguely accountable in a new country will fork the kernel, that just becomes the de facto new kernel, doesn't seem likely. We can only wait and see.
For the same reason Google has to abide by EU rules and regulations and VW has to abide by American laws and Disney has to edit their movies for China.