No its never been safe yet we are aware about those exchange hacks and possible fund hold ups or lock when there's something wrong on the platform we've been using which is something
thats why its never been a suggestable thing for you to store up your assets on a platform no matter how reputable or known it is just to play safe.Its better to be safe than sorry.
We do have lots of wallets which you could make use to store up your funds and you are owning the PK's of those one which do really even give assurance unlike
on platforms which you cant possible  do such thing.