Apple should embrace this if the project is in need of reference materials.
Apple is a hardware company primarily, so if someone buys their hardware because it will be compatible with an OS they may like more, that's still a sale for Apple. No funds are lost, because MacOS doesn't charge for a new install on Apple hardware.
Apple does not want to be a hardware company, in fact when they sell lots of hardware their stock price goes down. If they can't charge a monthly fee for it, they're not doing it.
I didn’t say they’re not a hardware company, I said they don’t want to be one because it makes shareholders very uneasy about the stability of the company.
Apple is a hardware company primarily, so if someone buys their hardware because it will be compatible with an OS they may like more, that's still a sale for Apple. No funds are lost, because MacOS doesn't charge for a new install on Apple hardware.