Are you talking about LLMs in general, or specifically ChatGPT with a default prompt? Since dabbling with some open source models (llama, mistral, etc.), I've

Are you talking about LLMs in general, or specifically ChatGPT with a default prompt? Since dabbling with some open source models (llama, mistral, etc.), I've found that they each have slightly different quirks, and with a bit of prompting can exhibit very different writing styles. I do share your observation that a lot of content I see online now is easily identifiable as ChatGPT output, but it's hard for me to say how much LLM content I'm _not_ identifying because it didn't have the telltale style of stock ChatGPT.