Microsoft is subject to US authority because they’re a US-based business. Meaning the gov can fine them or take away their business license or demand access to information they have stored, or any number of other things that Linux is simply not subject to, because they’re not a business and don’t store any user data at all.
You skipped my question: How exactly are the US-based stewards of Linux development subject to US authority?
Microsoft is subject to US authority, because they’re legally US-based. So are Linus Torvalds and the kernel foundation.
Microsoft is subject to US authority because they’re a US-based business. Meaning the gov can fine them or take away their business license or demand access to information they have stored, or any number of other things that Linux is simply not subject to, because they’re not a business and don’t store any user data at all.