It’s also worth noting that Harry wasn’t asking for something outrageous — just the ability to pay for appropriate security when he’s in the UK. That seems like a reasonable request, especially when safety is at stake.
As has been pointed out upthread, Harry did not in fact offer to pay, and this was just media spin on his behalf to mislead the public and cast the current law suit in a better light.
It’s worth noting that The Mail on Sunday reported it wasn’t true that Harry had offered to pay, and Harry promptly sued them for defamation. Mr Justice Nicklin who considered the defamation claim had this to say:
I consider that {the Mail on Sunday] has a real prospect of succeeding in demonstrating also that an honest person could have held the opinion that [Harry] was responsible for attempting to mislead and confuse the public as to the true position (and that this was ironic given that he now held a public role in tackling “misinformation”)…
My immediate impression was that the Mail was alleging that Harry was guilty of “spinning” facts to his advantage… Having now seen the sequence of events, in my judgment, the Mail does have a real prospect of demonstrating that an honest person could have held the view that this was precisely what was being done on Harry’s behalf.
Harry promptly withdrew his defamation case after this ruling, by the way.