I also do the same it was a lesson for all of us who often kept their money in exchanges, and those online wallets which do not have any good review or history are also not good for keeping our bitcoins in there , as they also can be hacked.
even there is some people used an exchange as their online wallet lol ,
as bitcoin wallet is private , you should not tell and held your private key to anyone ,
by storing bitcoin in third party like an exchange and other online wallet which you did not hold the private key , you are just giving away your bitcoin.
Private key has always become a general things before you're wanna for saving your money in a place, and maybe I know if you are trader and anytime you don't have a time for moving your funds into your wallet but for the normal people is not a traders and keep their money in exchange site. stupid ever.
many times i heard about people used an exchange as their wallet ,
yepp it is pretty stupid especially when you are storing about a lot of money ,
the hacked exchange should be our lesson to not go full 100% trust ,
even an exchange have a very trusted reputation.
If that is a cheap exchange website then it is likely to steal a person with a lot of bitcoin that will be stored. But for those who are known they have the thinking that trust is essential for that certain exchange to survive. Though some end up being a scam site.
did you know recent case about hacked exchange bitfinex?
they are trusted and have very large active trader stored thousands bitcoin there ,
but who know they manipulated everything by claiming themselves are hacked ,
it can be they just scam everyone.
never trust someone online easily , it will hurt you soon or later.