It was luck, or misfortune, that had certain humans born into certain families.
The British royals who are official working members have some comforts, but at a cost. They are the constant target of incessant whining, snooping, disparagement. They work hard at what is basically an office job for diplomacy, charity, and foundations.
And, there are many more families filled with people who are born to greater wealth and privilege than the British royals. They live entirely on income generated from stocks and old, established businesses---they don't work at all. The British royals who do have official positions do work.