http://coinmamailtcrg7fw6uorut3d35bk35rtmntkrtb4fgeov6pefvfutqd.onion/blog/is-using-a-bitcoin-exchange-safe
(You’re also trusting the exchange with your bank or credit card information, but that’s easier to recover if it’s stolen.) When you hold your cryptocurrency on an exchange, you no longer have control over it; the exchange does. And as exchanges are currently under-regulated and often under-insured, if an exchange’s wallet is hacked, or if the exchange decides to suddenly exit the business, there’s no way to recover your funds.