Looks like defi hacks happen every week. People are too mad about "easy" money and they ready to invest in everything
It's caused by the hacker has found that the vulnerability in the contract and the hacker was using it to minting more and more coins.
Defi is still experimental and then that's why there are so many bugs in defi projects but in this case, is the fault of the team. This bug related to the smartcontract and it has nothing to do with defi.