In this case it's coming from people who prefer dollars over Bitcoin, or from newly created Bitcoin.

I'll write the process:

- get a loan (receive new fiat)
- take new fiat and buy Bitcoin
- Bitcoin goes up (this step is crucial for success)
- Sell Bitcoin to cover loan liability
- Profit

This will not work forever, but it's undeniable that it has worked in the past and works now under the right conditions. The word 'Yield' is divisive though.

Think about it like using a fiat cheat code to take Bitcoin from Bitcoin holders (who actually prefer dollars) by using the fiat system.

If enough people preform this strategy, Bitcoins price increases through their leverage alone, and new sellers who want that fiat emerge. Booms and busts are ways to mine people's emotions.