Its no longer news that an ICO in Japan has lost over $400 million to hackers. They promised to pay back investors who invested in their ICO. Thsi is a huge loss. After I read that news, I began to wonder. How safe is Bitcoin and Other altcoins? What measures should we take to avoid being hacked ?
You cannot control exchanges in any way, so there is nothing that can be done about hack attacks on them.
The solution to this problem could be refraining from storing huge amounts of coins on exchanges (though I know it is not always possible and coins have to be there for at least several days).