although we have reached our 10th year anniversary, crypto is still on its infancy stage so a lot of growing up pains to see and experience like hackings. It will continue though because hackers are always one step of the game.
I believe this is the problem of every online industry because hacking is happening everywhere and most especially with government projects but crypto exchanges are getting severely suffered as their business model is purely handling the hot assets. Hackers and stealing are new due to online thing nor due to introduction of cryptocurrencies but being a online money, crypto space is facing big impacts.
I'm sure that exchanges are also evolving and trying to prevent this so called hacks
There are two possibilities why we are getting suffered even after many evolution against hacking :
1. Hackers are also evolving and that might be in faster manner than exchanges. Hackers innovates new methods and then exchanges and antivirus providers are fixing them. It is an usual practice in internet space. Always a versatile virus will born first and then only its fix will born.
2. Exchanges might be scamming people by the names of hacking. It had happened many times in the past. Some people are still suspecting mt.gox must be this kind as their treasury team is still holding and moving enormous amount of bitcoins.