Hackers are always active on this crypto currency world and looking to exploit any loopholes. In 2019, Crytopia exchange was hacked. At first i had a feeling that it was some insiders job or scam exit case but later the exchange came back online and team are working to restore their services as soon as possible, which means it was a really hacked.
Hackers are hackers. Doesn't matter if it's email, or bank account or crypto. None of them are safe if the person using them doesn't practice safe behaviors. Email with high grade encryption. Bank accounts with 2fa. Crypto with SHA 256. None of these things are actually cracked (those are crackers). Hackers just look for weaknesses. Usually people being careless with passwords.
We'll always see new cases too, because people will never change their habits.