ChatGPT is explicitly trained on
human writing it's training goal is explicitly to emulate human writing.
>It should only attempt a distinct style if prompted to.
There is no such thing as an indistinct style. Any particular style it could have would be made distinct by it being the style ChatGPT chooses to answer in.
The answers that ChatGPT gives are usually written in a style combining somewhat dry academic prose and the type of writing you might find in a Public Relations statement. ChatGPT sounds very confident in the responses it generates to the queries of users, even if the actual content of the information is quite doubtful. With some attention to detail I believe that it is quite possible for humans to emulate that style, further I believe that the style was designed by the creators of ChatGPT to make the output of the machine learning algorithm seem more trustworthy.