some say that the exchange is still vulnerable to theft. but after a lot of theft happened, I also thought that this was a conspiracy, namely whales that took a lot to dump and to the public it was said to be theft. What is your opinion?
This is just another conspiracy theory that has nothing to do with reality. Sometimes I think that whales been given some superpowers.
Exchanges are vulnerable and we are all aware of that. They are perfect target for hackers and there is no conspiracy behind it. It's true that exchanges should do much more on security to protect the funds of their users. And please be aware that hacking exchanges has absolutely nothing to do with blockchain which is a technology. So maybe you should get some information first before setting up theories.