Surely this can be done better without ChatGPT? One thing I can think of is doing it on internet forums. Somebody could use lots of accounts to generate content like that on HN. Now that I think about it, this seems unavoidable and I don't see how public forums can defend against it.
I suspect that the goal of the OpenAI/GPT usage restriction is not to prevent Every Bad Thing, but to avoid contributing to them in a way that draws negative attention.
After all, "Political Campaign Uses AI to Make Attack Ad" would get more clicks than "Political Campaign Makes Attack Ad" so there will be extra journalistic scrutiny whenever AI is involved.
The are ways to defend against it but I don't see any that aren't quite heavy handed, like forcing all users created after some date to identify using electronic id.