Is it that easy to hack or is the security of each project different, or is this a game of the people closest to it, because they are the ones who can reach it the easiest, and there are many other possibilities.
In sometimes, co-workers, or a mistake of the owner of the DeFi caused the hack. And this has happened to me before. I mistakenly send a code that was sent to me in Facebook and it used to hacked my Facebook account, they are some emails DeFi received and they were trying to quote those messages by replying them and a code which was secretly sent was forwarded to them and the site was hacked.