I thought MacOS was based on Linux - and apparently I was wrong!

I came across this link, which discusses some things I found interesting to learn:

• Linux is a Monolithic Kernel - I thought because you could load and unload kernel modules, that the Linux kernel had morphed into more of a Microkernel architecture because of this. But apparently not?
•  The macOS kernel is officially known as XNU, which stands for “XNU is Not Unix.” 

 According to Apple's GitHub page:

 "XNU is a hybrid kernel combining the Mach kernel developed at Carnegie Mellon University with components from FreeBSD and C++ API for writing drivers”.

  Very interesting. I stand corrected now on MacOS being based on Linux.