Once that was out in the wild it was only a matter of time before someone productized it, but there was no conceivable world in which nobody decided to, and there was no guarantee that it was going to be public in all cases. The basis for LLMs is so simple in hindsight that it's not even impossible that it'd been independently discovered and privately weaponized for many years before 2017.
By this logic, we cannot blame anyone who is the agent of anything that we deem to be inevitable. Just because it is eventually going to happen, that means you are completely non-culpable for being the person who does it. This could obviously be extended into justifying pretty much anything.
I'm not sure I have a specific point here other than that I think it's interesting that he became a target, not necessarily that he's actually blameless.
Trying to make money on selling the solution to the problem you caused (while also probably tracking literally everyone with the solution) is much worse than causing the problem and doing nothing about it.
Shit in the pool then sell the nets to clean it up.