There isn't. Not only LLMs are good enough to fool humans like this, but they have been that for quite a while now with the right prompting. A large number of r

There isn't. Not only LLMs are good enough to fool humans like this, but they have been that for quite a while now with the right prompting. A large number of readily available open weights models can do this, so even if large providers were to crack down on this kind of use, it's still easy to run the model locally to generate such content. The cat is well and truly out of the bag.