WSL1 doesn't use any virtualization. The windows kernel loads a module that implements linux-compatible syscalls, and WSL1 processes are flagged so that syscalls go to that module.
Can I say I'm fluent in Tagalog with the help of my "English Subsystem for Tagalog v1" (aka a hired translator)?
1. https://learn.microsoft.com/en-us/shows/seth-juarez/windows-...
WSL1 does translate many syscalls. Others it implements itself. It does not virtualize or hypervize. It does not emulate linux. WSL2 emulates/virtualizes/hypervizes, but WSL1 and WSL2 use completely different technology stacks at their core.
The translator is running inside the kernel as a driver.
If your company hires someone to speak tagalog, they become part of the company, and your company now speaks tagalog.
Windows supports linux binaries in the same way that it supports flash drives.