Dont leave your money on exchanges unless actively trading. Always pull out to a wallet. Furthermore, dont deal with crappy exchanges PERIOD.
Coinsmarkets
BITGRAIL
How he (most likely) lost his nano:
https://www.trustnodes.com/2018/02/10/150-million-worth-xrb-railblock-nano-stolen
how would you rate GDAX/Coinbase ? are they trustworthy to some extent ? i currently only trade there, but have an account with Gemini and Binance - both verified.