Money is that power.
You cannot have billionaires and them not be immensely, structurally powerful.
That's the entire point of capitalism, that resources, including labor, be directed by those with capital.
Believing you can have a single human being in control of a non-negligible percentage of all resources of a country, and they wont somehow be actually powerful or influential is moronic.
Taking the power away from billionaires literally IS taking their money.
That’s the stupidest thing I’ve ever read. Power is power. Members of the Communist Party in the USSR were as wealthy as their subjects, their power differential was enormous.
When your power is to determine which day the recycling truck is dropping-by, hardly anyone wants to coerce that power. But when it is e.g printing money the calculus is massively different.
I take it you've never encountered a homeowner's association.
Of course, you probably mean to remove their power centers without removing their money. But that doesn't make any sense. Money is power. You can't remove the power from a billionaire and leave them a billionaire.