I've always thought filesystem compatibility between OSes should be a priority. Moreover, I've never understood why Microsoft developed ReFS instead of adopting ZFS.
If Linus is afraid of Oracle, MS should definitely be afraid
More likely Microsoft doesn't want its OS features to be controlled by a third party. The issues with using ZFS in Linux stem from the GPL. Neither Windows nor MacOS are affected.
Yeah, so the semantics of the filesystem APIs on Windows is very different, so you're not going to easily port filesystem code to Windows from other operating systems. ZFS is CDDL and that won't fly on Linux. Linux filesystem code is GPL2 and that won't fly on macOS. Licensing is a bitch.