Comment by aidenn0

"Windows Subsystem" is a compound noun. It could serve as a noun phrase in a sentence like "Windows Subsystem is nice" or "I like Windows Subsystem", although without some article or other determiner (like "the" or "this") it doesn't sound very grammatical. Generally only mass nouns, like "dirt" or "food", or plural nouns, like "people" or "subsystems", can be noun phrases without an article or determiner. "the Windows Subsystem" or "a Windows Subsystem" (or "a Windows subsystem") would be (complete) noun phrases.

What about the "Linux kernel module for USB on Linux", what about the "car tires for special use in cars"?

I regard that as Microsoft's problem.