Only WSL2; WSL1 was an actual subsystem.
WSL 1 is long gone for all practical purposes, yet it still dominates conversations.
Also everyone on FOSS gets it wrong, WSL wasn't a subsystem like classical Windows NT ones.
It was based on Drawbridge research using picoprocesses, a new approach for library OSes.
https://learn.microsoft.com/en-us/archive/blogs/wsl/pico-pro...
So this is Darwin/BSD Subsystem for Linux 2.