Handling the cryptos, finance tools requires some enhanced knowledge as there involve risk factors.
The DAO hack has occurred in June 2016, through which hackers managed to transfer 1/3 of DAO funds to another account by making use of the vulnerability in its coding. This forced the restoration of funds by the hard-fork of the ethereum blockchain.
Some of the DeFi tools are gone through the security audits, for example, DAI, has gone for 4 security audit. Thus as a DeFi user, it is our responsibility to keep ourselves updated to the changing terms and conditions of DeFi services.
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We can make open financial system with DeFi !!