very in-character for him to indignantly refuse to donate despite literally owning an entire bank vault full of gold

They only accepted Harry for his wealth even tho he had no prior magical knowledge and was actively hunted. He had a shitty but safe life in the Human World but they kidnapped him anyways. Perhaps a planned hit to takeover his wealth ? Sounds like good grounds for a Lawsuit.

That’s hysterical and yet how I kind of feel when Drexel and UNH send for requests for donations

"One hundred and twenty THOUSAND GALLEONS"