Hacker could’ve printed unlimited ‘Ether’ but chose $2M bug bounty instead

[PawGo]

Hello

I am not sure if this subject was mentioned here, but it looks a bit... scary - to produce a unlimited amount of coins because of bug.
Brief article:
https://protos.com/ether-hacker-optimism-ethereum-layer2-scaling-bug-bounty/
and more detailed explanation:
https://www.saurik.com/optimism.html

I wonder how many people knew about it - and used it.