They have uncontrolled OCD that manifests as financial hoarding. If they were hoarding cats, or rusty old broken appliances, we'd get them help, and clean up their property. But Billionaires get lauded as wildly successful businesspeople, and are encouraged to abuse the financial system even more, and sometimes the government gives them lots more money, just for demanding it.

They won't give money to people who need it, but if you're a mentally ill pedophile, they'll give you as much as you demand.