40 percent is not high it is maddness . This whole thing makes no sense, post crypto as collateral, borrow and pay 40%????
40% APY. Not 40%
If you borrow $100,000 and kept the loan for the whole year, you pay $40K in interest
If you borrow it for 2 weeks, you pay $1550 in interest for the 2 weeks and you get your collateral back, if you put 30 Ethereum, provided you did not get liquidated if Eth went down in value within the 2 weeks and you did not post more capital when you got the margin call
But during that 2 weeks, with your elite trader skills, you bought and shorted btc 100 times and earned $50K in profits

Oops, the 40% is to the lender (USDT depositor of $100K) but you get the idea you just adjust the numbers, higher interest rate for the borrower
The 40% APY is variable, every depositor of kucoin knows this as well as AAVE depositor. Based on supply and demand. Demand is very high, fomo bull market, traders want to trade
The problem with depositing at CeFi like Kucoin is now you're trusting that exchange won't shut down or give you some KYC/AML issues
So people go to AAVE, where it's all smart contract based, but lower APY