I wonder if they get to see making money as a high score, you "must" be productive at all times even if you have well over enough - people get stuck playing looter games even when they have basically completed it, so much that "end-game content" is a big thing - got to get that latest loot.
So these people never wake up one morning, with the alarm going for a business meeting or whatever, they never sit and think "Wait, I am worth 50 billion dollars, I can just relax and go fishing for the next week, next month learn to paint", whatever. Even if they that for a month or so they'll get bored eventually and go back to chasing that high score.
Unfortunately the high score isn't "Would this be best for society?" - it's "Would this make me money regardless of what it does to society?" If they introduce something that is bad for society it doesn't matter, as long as it makes the extra 20 billion - even if that extra money materially wouldn't make much of a difference to the upper classes lives. I've made this extra money therefor I must be a good person right ? All the anger of the underclass is because they are failures, if only they would have made the business deal that I made, invested that 100G in what I invested in, they'd be winners like me.
Some of the great Sci-Fi involves "what would people do if they had everything" e.g. the Post-Scarcity Culture series. What would bring your life meaning if you had billionaire resources. A question we need to start asking, let alone answering.
And of course you must remember 50% of the human race (probably 90%...) is just not that smart and definitely not capable of introspection. So there's that.
And even when they do start charitable organisations, how often to they even benefit those at the bottom? The homeless people by me all waiting for government funded homing, none get a dime from any charity ? Yes a lot of them do good work e.g. Uncle Bill's foundation releases the Our World in Data series. But then you see them throwing billions around in deals and wonder "does this benefit anyone beyond the odd toilet being built in Uganda?"
IANAE (I am not an economist, obviously!)