Most rich people's money is not cash in the bank and houses. It is investments in companies. I am not talking about owning stocks and shares, but many have acquired their money by setting up and building up companies: Bill Gates, Elon Musk, Richard Branson come to mind.
Now, people like Bill Gates has transferred billions of dollars to a charitable foundation, Warren Buffet has as well, to name but two. But this has caused them immense problems because the conspiracy theory universe, and it is VERY large, have said that Bill Gates is seeking world dominance trhough his charitable giving, ditto Warren Buffet. That he is part of the shadowy 'deep government' that is a conspiracy of democrats and people like Gates and Buffet who want the world to be run by a paedophile conspiracy.
Enough to put anyone rich off giving most of their fortune to charity. Elon Musk's wealth is mainly invested in the companies he owns and runs. If he suddenly sold up and gave to charity, the companies might well go bust.
I dislike this demonising of groups of people and blaming them for all our ills. That is how pogroms start. Blaming the Jews for a countries economic ills because some of them work in banking and finance and have established successful businesses, can have results that we know about only too well.
Look around the world to day and see the demonising of the Rohinga in Burma, Christians in Pakistan, Muslims in Indi or the UK. Jews in many countries, including our own. It starts small but then takes on a life of its own.
Demonising billionaires in the UK is small beer, but it is the kind of mindless thinking that builds up to more serious things. By all means, study specific peoples finances and query their spending, but be very careful of putting people in groups to dislike and blame for things, unless you have first done a very detailed study of their lives and what they do. In this case know exactly who each individual is and how they spend their money. Many are already very generous givers to charities, of all kinds.
We have seen the effect that the withdrawal of government or lottery funds has on these organisations, with many charities having to drastically reduce their operations, and even close. the same applies to many community arts and sports programmes. The extent these organisations are dependent on donations and involvement from rich individuals, probably exceeds government and lottery funding.