Well, he has always been trapped in a gilded cage. Not a life I would envy. It’s hugely preferable to be comfortably well off but able to move through the world anonymously. Nobody is interested in him as anything other than a Royal or ex-Royal, so he is sort of obliged to make money out of that somehow, or to rapidly spend all his money and end up back in the position of being totally reliant on the protection and wealth of others. He’s unlikely ever to be able to get a “normal” job, because someone will find out the ex-Royal is working in the army again, or in Aldi (😉), and either kidnap him or sell the story to the media. Plus, it’s a bit difficult not to end up screwed up after the childhood he had. I wouldn’t appreciate my family’s genuine tragedies and dirty washing, and all my family’s ancestors’ dirty washing, being put on display for discussion by the entire world. It’s not as if mere mortals don’t end up suicidal when they find themselves in the national or global spotlight, even when they have courted it. Normally, courting it is a sign of poor mental health in the first place…
Being wealthy enough to piss your life away partying, taking drugs, sleeping around, or whatever else huge wealth can make possible, doesn’t seem to make anyone happy. Using great wealth and power to support or set up pet projects generally also results in negative attention and accusations of abuse of power, unwarranted interference in politics, being out of touch, doing more harm than good, etc.
So, whilst I would never bother to read his book, I think those who are critical of someone with all his advantages growing up so screwed up are being wilfully blind to the effects of so much dysfunctionality on someone’s mental health. It may not be all his family’s fault and he may be unfairly angry at people just as damaged by their environment as he is, but I really do not envy him his life or wealth, or his need to keep airing his dirty washing in public to sustain a lifestyle that doesn’t even make him happy, but from which there is no true escape.