Nobody should be allowed to have a billion bux, much less a trillion.
Set a wealth level that triggers a 100% tax. High enough they'll never have to think about money. Give 'em some limited say in how their tax bux are spent, so they can still play king-of-the-hill with the other billionaire kids.
What I can now say with authority is that nobody should have a trillion bucks—ever. It’s entirely absurd.