What does this responsibility mean in practice?

Like what are the actual real consequences if it turns out your code is bad or whatever? I assume you get banned from contributing?

I couldn’t immediately find any more information on what this all means in practice

If it's consistently bad with no signs of improving, banning makes sense. People made mistakes even before LLMs though, and you'd only ban them if they didn't improve and so were a giant waste of time. I don't see why that wouldn't translate here.