because breaking into an exchange system is very difficult, direct attacks on cryptocurrency users still exist.
So it's a combination of skills, hard work as well, and then one day when everyone thought that crypto exchanges are safe, they will attack, get everything that their hands can reach get out used mixing services to hide the trail or sometimes they won't moved it at all and again wait for the perfect time when everyone is not looking.
No exchange is safe on what most platforms do promise on.Yes, we can think off that there might be some inside job in these cases but no one can really still make a conclusion since these were only alleged or speculations but high chances this would be most likely the case.This crypto space would involved lots of hacking events and it would continue
because this market do involved millions and billions of dollars.
Yep, they will have to wait for a cool down, however, there are also group of people who's work is to track those movement. I think it all started with the Mt. Gox and crypto investigators are still fascinated by it. So once we heard about hacking incidents, we will see a lot of tweet about it. Experts on the field and even some crypto enthusiast because everything is public in the blockchain.
So it will be very difficult for hackers to move the coins, without anyone noticing it, specially if it involves huge amount of cryptos.