Let me dryly discuss this because I feel people are being too gut reaction here

There is a "real world use case" that most would agree with, just cynical. Borrowing and lending crypto is not a taxable event. You can have a capital gain on the blockchain and borrow stablecoins against it, indefinitely delaying taxation. At the same time, as of this moment you can wash trade crypto and tax harvest any new bottoms, making this tax favorable (a common assumption here is that crypto is an expected value 0 gambling game).

Example in the wild https://twitter.com/mcuban/status/1465002539603185668

In this way, it resembles high finance trades e.g. that Matt Levine of Money Stuff used to do to lower client taxes