I think DeFi is one of the main reason that ethereum gas is soo high.I have never seen such a gas fee.You have to use Gwei 500.Its still unbelievable.And we are all suffering because of that.And Because of the DeFi trend ethereum's gas fee is increasing.Most DeFi coin is listing on Uniswap.And all wants their transaction to go fast.And they are using more gas fee and that's way gas fee is increasing.If you pay high gas fees to transfer or trade your coin in Uniswap or other exchanges ,then miner wants more fees.The more you pay, the fees will more increase.And because of DeFi coins updown price more and more transaction are running.I think vitalik should do something to stop such a mess.