And they are not oligarchs because that's not what that word means.

Also, "net worth" is not "money". Shares of a company aren't money.

Shares of a company are indeed money - or can be used as money in a roundabout way.

They can be placed as collateral in exchange for a loan or other similar ways to access capital immediately.

If Zuck walks into a bank and asks for a million dollars cash on the spot and is willing to place a few thousand shares up as collateral, he gets that done in minutes.

He can get millions, but he can't get his entire net worth. His net worth is quoted as if the marginal price of one Meta share is the price you'd get for selling every Meta share at once. Which of course doesn't make sense.

It doesn't make sense, until it does - because Mark's shares are quite literally a separate class from all other shares and IIRC have 10x the voting power as common class A stock.

If he announced he is selling them all at once, I have no doubt in my mind he could get someone (or a group of investors, or a bank) to purchase all those class B shares almost immediately at a VERY healthy premium. Meta shares are currently around USD $715. There's absolutely zero doubt in my mind that if he was to sell them in a block, with the outsized voting power, he could command roughly USD $950-1100 per share with ease.