No they wouldn't. MS would only be able to sue people who reimplemented the NT kernel API for their own projects, which is basically just Wine and ReactOS, but

No they wouldn't. MS would only be able to sue people who reimplemented the NT kernel API for their own projects, which is basically just Wine and ReactOS, but those projects have no money. This case is not about using APIs to build apps. Standard software licenses clearly allow that. The case is about reimplementing them.