I guess you are not aware that Kraken have been attack by hackers.
Where have you seen Kraken has been hacked? Source or it didn't happen.
Please forgive my way of explanation, Kraken was not actually hacked and it was the only exchange that usually wants to help others crypto exchange that has hack issues but an attacker manages to steal fund from Kraken users through malicious email just what happened to Binance users through telegram last year if I could remember.