Socialist Friendly Robert Reich: Why Biden's plan to tax the super rich is moving from unlikely to likely

Socialist friendly Robert Reich is happy with Biden's proposed wealth tax :

For example, suppose someone named Mark Zuckerberg owns $100 billion of Facebook stock, for which he paid nothing when he founded the company, and has no other taxable income. For the first year under the Biden plan, he’d owe $20 billion in taxes even if he didn’t sell any Facebook shares. The next year, if his stock increased in value, he’d owe another prepayment equal to 20 percent of any increase in value beyond $100 billion.

If this scheme got passed: Reich would complain that the rich aren't paying taxes on years they didn't have capital gains.