Did they seriously think they would still be financially supported by the RF ?
I don't see any indication they expected to still be supported (given that Meghan is a workaholic, and Harry's clearly proven himself adept at landing big money deals, they clearly were both willing to roll their sleeves up and start earning money). But I don't see anything wrong with an extremely wealthy posh bloke from a family where it's common to not work, and where your own father and brother were/will be financially supported by their family for their entire lives, and expect a similar level of financial support from their own family.
It's very convenient for people to pretend that Harry is nothing more than an employee of a company called BRF, but this is literally Harry's DAD we're talking about.
Genuinely, is there a single poster here who would honestly say if their child was being racially abused and potentially subject to death threats from terrorists, and your family were literally billionaires - and you came from a family where it's the norm to be financially supported your whole life - that you'd have no expectation at all of your super-wealthy dad giving you a bit of money to keep his own grandchild safe?
FYI another white supremacist terrorist was convicted in court this week, he was found with both a bomb-making instructions, and a "manifesto" which contained racist cartoons of Archie.