Even though there are still very few trading platforms that have never experienced security exploitation, the recent incident with Houbi should serve as a reminder for everyone to remainattentive and prioritize their security.
Nothing can be perfect, many platforms have back doors that can lead hackers straight into the exchange, and hackers are now smarter than before. I am really amazed to see their hard work and how they proceed to make attempts. You are right; the KYC was made so that fraudulent activity would be reduced and people could not scam others in p2p trades, etc.
Still, KYC does not make any exchange vulnerable to hacks, but the back doors and out-of-date infrastructure of the platform and the lack of enthusiasm of the team make the platform vulnerable to hacks. And the Houbi exchange had some issues with liquidation, which was also discussed here.
I wanted to know which exchanges have not been hacked yet; you should write some examples. It would be helpful.