Broke governments are going to be even more unbelievably rapacious than they are now. From Doug Casey at internationalman.com:

International Man: President Biden’s Treasury Secretary—and Obama Fed Chair—Janet Yellen recently floated the idea of taxing unrealized capital gains through a “mark-to-market” mechanism.
What is going on here?
Doug Casey: When you tax unrealized capital gains—as they do with foreign stocks in a number of countries, like New Zealand, where it made my life expensive and miserable while I was living there—any stock market assets that you have are marked to market annually. This is a big disincentive to own them because whether you sell the asset or not, you’re going to pay taxes as if you’d sold it.
This is why very few Kiwis own foreign stocks. They’re liable to be taxed on gains, whether or not they sell and actually pocket the gains. I presume that’s what Yellen is talking about. It would make it pointless to buy a stock like Berkshire Hathaway and just hold it for decades to escape capital gains taxes. But the bright side is that if this law was in force, Warren Buffett would no longer be able to whine about the injustice of paying fewer taxes than his secretary.
I question whether the proposal will be enacted, though, simply because it’s so stupidly destructive. It’s clear that Yellen needs to collect on some more six-figure speeches to gain a proper understanding of it and get off that hobby horse.