I never use GPT for anything other than amusement like asking it to write a story about living in the hood but in the style of a grumpy old man being the narrator.

In the past and to some degree to this day, I work(ed) in copywriting. The people in that industry were very concerned that AI was going to took their jerbs! But as it turns out the use of AI in this field is very strongly frowned upon and anyone using it that gets caught could find themselves blacklisted. There are tools to detect it's use as well.

It is interesting that you were quickly able to determine what was AI driven though, I haven't messed around with it enough to really notice.