The decentralized Finance technology are new and varied. That's the reason why many of them are attached. It's also due to the lack of safety measure implemented by those DEFis.
As we grow towards a universal platform and solving issues, Defi would be one of the most secure way to handle our finance, fast, efficient and secure.
this is another lesson to learn before releasing a new ideas First make sure there are no holes and security issues before launching a project . Since it's a big money involved there is also big risk and like what happened there are big money that has been lost for that experiments.