Not only can scammers do this, but they will prefer to do this purely for cost reasons. Scammers have to turn a profit, too. And nation state actors will do it for traceability reasons.
So the really bad actors won't use OpenAI anyway. So OpenAI should stop lobotomizing their service for the non-nefarious actors who are just trying to make the next generation of software.
Sure, go ahead and put subtle steganographic fingerprinting in the OpenAI output, so long as it doesn't affect quality. This will hinder the low-tech bad actors who can't run LLaMa themselves, and won't hurt the good actors.
But it's the most infuriating thing to try to build on the GPT4 API when its "helpful assistant" chat type mindset occasionally breaks the workflow.