I like these taxes.
These billionaires are your enemies. Tax them to death.
Yes, that's why Sanders says "bilionaires should not exist". He wants them dead. There's a problem however, their wealth is not cash in a mattress and will be pulled from the market and venture funds. There will be a lot fewer well-funded startups. The startups will be uncompetitive. Technology will stagnate. The economy as a whole will stagnate.
I worked for a wealthy guy once. He put most of his wealth into salaries to give the new company a chance. It failed but not before producing technology that was bought up and still exists today. That would not have happened with a wealth tax, and I would have had two years less of meaningful employment.