Except that Microsoft is still hostile towards Linux with patents at the same time but no one talks about it.

Microsoft loves Linux (the kernel), but they hate with passion anything userland that could ever have the dreaded "GNU" or "GPL" letters anywhere mentioned.

Isn't WSL Linux userland running on NT Kernel? Just the opposite of what you said?

Sorry if I said something silly :)

WSL is an implementation of (some of) the Linux kernel APIs on top of the Windows kernel. The userland that you run in WSL is technically independent of WSL itself, but Microsoft provides direct support for installing Ubuntu there.

It's a big company. The people being hostile with patents probably don't talk to the people donating to the Linux Foundation.