I don't know if they will actually make any more money from the Netflix and book deals - haven't those advances already been given to them? I think people will hate watch/hate read them in the short term. What after that, though?
Do they want to be loved, appreciated, respected, seen as serious activists? Whinging from the ultra privileged is not a respected part of the American way of life. They've allowed a lie about racism to hang in the air for 2 years and made a fool of Oprah Winfrey. Supportive, left leaning TV stations like CNN have plummeting ratings - right leaning Fox and radio like SiriusXM (Howard Stern, Meghan Kelly to name a couple of their stars) have many millions more followers. Notoriously private A-listers won't want to risk their secrets being spilled. Hell, even your average B,C and D listers don't want their dirty laundry hung out unless they are doing it for themselves.
Some of the Asian market, I agree, might take on Harry for product endorsement. It's a bit unseemly though, I real fall for a royal, selling Whisky or whatever. And it will not square with the RF's codes of ethics about products/freebies etc. I can't see Meghan being attractive for that market, though.