I don't have a full answer to my own question to be honest.
In the above example though, you'd never be able to prove that it was or wasn't your contribution so it's easy to say you bear no collective responsibility. But would it be true?
I'm not sure, but I can't say definitively you would bear no responsibility.
I'm trying to find an ethical analogue. If you dig up an old porno that I made 20 years ago, and show that to my child, am I responsible for the trauma it causes?
I would find it wrong to say "I bear no responsibility because that's just how things are" if that makes sense.
Going without gpt4 can put you at a disadvantage for some work.
Not paying taxes affects your life much more negatively.
Given the different costs, logically it seems that paying taxes would be something you have less collective responsibility for.