I think last year alone had more than a billion dollars worth of crypto hacked on defi, there's some trackers out there [1]. On one hand, you have amateurs that leave their private keys on cloud services and try to cash out while living in a place like NYC, on the other hand, you have people who know what they are doing or perhaps live in places that actively encourage those activities [2].
1: https://cryptosec.info/defi-hacks/
2: https://www.bbc.com/news/business-59990477