You’re perfectly clear, as I believe I have also (or I wouldn’t be repeating myself as each comment would be different if it wasn’t clear). You’re argument isn’t consistent with the rest of computing. I keep repeating myself because you keep refusing to engage. You just keep dodging.

What is the difference between getting software from the unnoficial source such as the AUR and getting software from an unofficial source on mobile?

If you can answer this then it’s done. This is the third time I’ve asked it and you haven’t answered it once. If the term, as used by Google and Apple, we’re necessary or had functional utility then we’d use if for Desktop also. Clearly it isn’t necessary or functionally useful. It’s used out of utility by these companies to sow mistrust.