The worst crimes are the physical ones, you can always make more money but when criminals torture or physical attack you to get your private keys that is a a completely different level and its really traumatic.
This might be rare but the most traumatic thing to be happened on a crypto holder where someone do know or do have the hint that you are engage with
crypto and been known that holding up some nasty amounts then you are really prone to these stuffs that's why make yourself anonymous or private would be always a good practice.
Don't share up your holdings.
Mt.Gox has been one of the biggest hacks in the history of bitcoin and the exchange Coincheck has been the biggest hacking of a cryptocurrency in history
The greatest and biggest crime in the world of cryptocurrency, is the ability to scam investors from their hard earn money in exchange of some shitcoins without life in them. One of the major reason why the SEC and ETF still fight with cryptocurrency is the regulations than will protect the investors and their investment. Scam is the greatest and biggest crime from my perspective in the world of cryptocurrency.
Common situation that do happen yet these exchangers are honeypot for those hackers yet they do know that the huge money is lurking on these places so its normal to think
that these are primary targets.