After CoinCheck and NiceHash, the BitGrail hack is the third major incident in less then 4 months. Of course, the Italian exchange kept most of the funds in a hot wallet, and many other exchanges are probably still doing this, practically inviting hackers to rob them blind.
https://www.notebookcheck.net/Italian-crypto-exchange-BitGrail-hacked-for-US-170-million.282656.0.html