If you want Jeff Bezos to pay taxes on the value of Amazon (which is the measure by which he is a billionaire) you basically force him to sell Amazon. How else can he pay the taxes?
In such a system, where you will be forced to sell your success, Bezos (or anyone else) would never have created Amazon.
It's worth keeping in mind that Amazon generates several billions of dollars in taxes every year. Every one of the million plus employees of Amazon pays taxes, every transaction is taxed, every service Amazon buys from other companies is taxed and so on. If you kill Amazon by going after Bezos, you have caused society a net loss, even if you get all his money.
Economic equality is a different topic IMO. If a teacher makes 10% the money of a doctor you get problems in society since teachers can't buy houses priced for doctors and so on, but the difference in wages between workers has nothing to do with billionaires. Nobody became a billionaire from earning wages.
This has to be solved from the bottom up, not from the top down. Increase minimum wages, dictate working conditions and so on. You don't have to target billionaires to do that. Most countries in Europe has at least one billionaire, in fact lately the wealthiest person in the world is French.