Okay (if surprising). What about Bernie Ecclestone (and the 2,999 people in the article)?
I don't know how Bernie Ecclestone's wealth is made up.
With all these people, it depends how liquid their wealth is. Probably for most of them much of their wealth is simply their shareholding in a company they started times its price.
Assuming you are a homeowner, do you think it would be fair for the government to tax you on the value of your home - say 2% per annum? Could you find 2% of the value of your home every year without selling it?
OR take Elizabeth Holmes: her company - Theranos - was valued at $9 billion in 2014 and she owned 51%. At 2% tax, she would have had to find $90 million, but the valuation was based entirely on what she promised not on revenue and profits of which there was very little. She didn't have $90 million to give to the IRS. In fact, now she's a convict because her promises were fraudulent.
If EM doesn't pay tax currently and wouldn't on this new idea, what other proposal could there be?
The problem is that shares aren't real money. So probably you could tax them when they people turn the shares into real money. If Elon Musk sells $1,000,000 of shares, he should be taxed a percentage of the profit he made, or his "gain in capital". We could call it "gains of capital tax", or more snappily "capital gains" tax, but that's what we already do. Maybe there are some loopholes that could be closed, but other than that, extra taxes for very rich people seem somewhat punitive to me.