5. It Is Not Allowed for Crown-Employed Royals to Work Side Jobs

Conflict of interest is the cause.
Not at all.
There are severe regulations governing the finances of the British Monarchy, and financial scandals are almost nonexistent. You are not allowed to have another source of income if you are a full-time royal employee of the Crown.
That’s correct—no jobs, side projects, or moonlighting allowed. The purpose of this guideline is to prevent conflicts of interest. A royal who works both full-time for the Crown and a British corporation, for instance, would feel conflicted about whose side to support.