#Bitcoin is portable wealth,

You can "opt out" of any Government, and instantly take your net worth somewhere else.

You can't do it with real estate. Takes time to sell.

Stocks are faster, but moving large sums via banks doesn't work.

Imagine you move to Iceland. You open a bank account and try wiring 10 million in from a US account. Likely outcome: you will be flagged as a money launderer / criminal and the money will be blocked.

Try moving 10 million in gold. That's 240 pounds. Not exactly inconspicuous.

$BTC doesn't need to transfer. You can just use it, wherever you want.