I have zero idea. I did get the correct APY for one month before withdrawing, paid no fee, and was left with the same question.
Of course, that sounds stupid as hell and you'd certainly hope that someone thought of something better, but this is exactly what happened with Terra/LUNA, except with more financial engineering to obfuscate the "if it goes down 25% we're fucked".
What's a 3x?
In the context of "using leverage to provide better than expected returns in a Bull market", someone can buy TQQQ, securitize/create derivative (this is exclusively what crypto does) that returns 1.5 times the NASDAQ, sell you that derivative, and if the NASDAQ goes up 5% (TQQQ 15%) you get 7.5% and they get 7.5% (and your money).
If it goes down, you lose everything and they keep the money you gave them.