Back to my question, this year has seems to be the worst year for the crypto space, Duelbits hack, Binance hack, many more hacks that happened on the space. My question is: does it mean that no one can outsmart those hacker?
There's no platform that's truly secure and free from security threats. Even though developers continuously improve their security, hackers will still keep trying to break into their systems.
Why is it that their major targets was on well know sites?
This is because of the money, since popular sites usually have funds they can target. It can also boost their reputation, as successfully hacking a well-known site is usually more difficult, and if successful, it proves their skills.
Does it mean that no one can develop a stronger security measures to outsmart those hackers or does it mean that most of the hacks that is happening are from Insider? Or maybe someone who is already in the system are leaking out their information to hacker ?
It could be from insiders, but it could also be because the site's security is weak, making it exploitable by hackers. No matter how hard developers try, the most they can do is improve their security and minimize the potential for hacking. They can't make a site completely safe from every possible threat.
Again, how do you trust the people that are being employed to work with most of the exchange or gambling site?
What are the strategies to ensure that the staff they are hiring is trusted and can not compromised their duties or works
I have no business with anyone who works on the sites I use. It's the site owners' responsibility to employ trustworthy people who won't exploit their sites.