You can assume that the motivation is for the author to build something and share it with like-minded hackers. If he picked something OTS, that wouldn't be a story on HN.
It's like, idk, someone is publishing a toy OS source code, yet they're completely skipping over quote-unquote-basic things like UEFI boot entry registration. It just feels...not necessarily fakey but odd.
Let me help: "basic things"