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 
We see all these stories all the time and still people are not learning is the biggest problem, storing your coins in your mobile or online wallet is the dumbest thing you can do and if he is holding that much coins what stops him from storing it safely, hardware wallet is not that expensive and there is no point in investing millions if you do not know how to keep the coins safe.