Reportedly one of the reasons H&M feel aggrieved is because they think they are being treated differently from other members of the RF.
In one press statement they cited earning a living whilst carrying out Royal duties was not without precedent.
If you remember in their break away statement what they said was they were stepping down as "senior" royals, not stepping away from being royal.
It's true that other members of the RF have earned whilst still being royal.
B&E, Zara and Philip by way of example.
However there are some pretty fundamental differences.
Earning tens of thousands for flogging milk or a car company or getting a job at Sotheby's is not on par with signing $100m deals with Netflix.
A deal designed to provide content to a large audience that would influence people in line with H&M's political, aspirational and cultural beliefs.
H&M don't just want to earn a living, they want to be global icons/movers and shakers. That's fair enough but it simply isn't compatible with being "in" the RF.
Also bear in mind his cousins do not receive money from the sovereign grant, Duchy of Cornwall or get security provided by the state (H&M wanted to retain the latter 2 losing only the relatively minor grant).
The other distinction is simply who Harry is. Saying he isn't a "senior" royal doesn't really cut it.
His cousins aren't "senior" because of their relative proximity to the line of succession.
Harry is the grandson of the monarch but unlike his cousins will become the son and then brother of the King.
His actions (and that of his wife) have far greater implications to the crown than anyone else outside of C&C plus W&C and their children.
The only way to protect the Crown from any fallout if H&M want to go their own way on a global stage is to have a firm line of separation between them and "working" royals.
As for "service is universal" wtf does that even mean?
I'm sure they believe they will do good works and highlight worthy causes but fundamentally they will benefit hugely from it.
It's not the same as someone like Bill Gates who earned his fortune and then became a philanthropist.
They want to appear philanthropic whilst building a fortune.
I honest don't mind them wanting to break free, nor earn their own money but I can't help feel they've been somewhat naive in their expectations and demands - even at times sounding pretty petulant (eg their latest statement).
Overall I think they could have achieved the same outcome as they have with less drama/upset and a lot more goodwill had they acted differently.