The only way to get a license for a modern MacOS is to purchase a mac. The license is nontransferrable, forever attached to the specific system purchased. It is a violation of the EULA and most likely Apple's copyright to install MacOS on systems that are not entitled for the OS, which is every system that's not a Mac.
In other words, you're violating Apples copyright by running MacOS on a Hackintosh, and Apple is well within their rights to sue you for damages. Defending these types of lawsuits are expensive.
You should not manually upgrade or replace the memory in these Mac mini models. Instead, contact an Apple Authorized Service Provider or Apple Retail Store to install memory for you."
Yes. Upgrading the memory on some older Minis requires you basically disassembling the entire machine. I've done it. It's not brain surgery, but it's also not as easy as turning the little circle thing on other Minis. Nowhere does it say it violates any license agreements, just that Apple doesn't suggest you do it.
In other words, you're violating Apples copyright by running MacOS on a Hackintosh, and Apple is well within their rights to sue you for damages. Defending these types of lawsuits are expensive.