Exchange to me are one of the absolute ways to lose your money not because they will steal it, (at least we haven't heard this in w while)  but for several other reasons to deny you access to your funds that you willingly gave them by start with things such as they are synchronising their wallets so they cannot process withdrawal, or they will say their machine detected some issues with your account then they close it. In all this, there is nothing one can do because you accepted to the terms. So exchange sites is a no no for me.