Earlier quoted context omitted.
They're possibly something like a dosdude patcher or modified bootloader to run an OS like Catalina on it.
I have trouble understanding why people go through these hoops. Yeah, I get it, people love their Mac's... but the company that produces them actively undermines your ability to continue using perfectly good hardware past what they feel is "profitable". This leads to huge efforts to hack/reverse the updaters, or alter newer OS versions to trick them into installing, etc. I'd personally jump over to some system that d…
I made the switch a year ago after having reached my breaking point with Windows and it still was a massive pain and daily loss of performance. For comparison, I also rooted my Android phone and installed LineageOS without google services which crippled it significantly and it still wasn't as much as a pain to do as using Linux on my workstation.
People often say (not talking about you, just something I see on HN often) that it's easy nowadays and anyone can use it but it's not been my experience and I think it's the very attitude that keeps it from being a commonplace OS for the consumer market. I keep a list in a file I call "linux sins" but without having to look at it you can figure out the problem by just googling any benign problem someone might encounter on their OS and checking the answers. Do the answers start with "Click there" or "Open your terminal"? I don't see the situation changing since people who develop for linux generally refuse to acknowledge the problem.