Yeah, I use ChatGPT to assist with the grammar in my posts here at times. However, I need to explicitly instruct it to only correct the errors and not make any other changes. Otherwise, it completely rewrites the entire message, and the language ends up sounding unmistakably like ChatGPT. As you mentioned, it’s immediately apparent because it has a distinct style, and no typical human writes in that manner. Like you said, it’s easy to discern but challenging to confirm. Additionally, with the right prompt, you can probably get it to generate text that sounds more conventional.