This sucks, I see stories like this all the time on here. He really shouldnt have been keeping that amount of crypto online though. It should be on paper wallets or a hardware wallet. Sad for him 
Yes of course leaving such a huge amount of Bitcoin on the net is totally insane. I hope he and any other whale investors pay attention, because scammers will come back again when bullmarket start to find new victimsThey dont only attack on a bullmarket but even to this time yet these hackers do knows bitcoins value potential on upcoming years.
We've seen exchange hacks as of this years which proves out that these criminals are just finding the right timing to stole precious bitcoin.
Keeping coins on a web-wallet isnt really ideal as i have read it do involves access of email which means he might stored up some keys or simply
able to access his exchange accounts?