Not sure why this is a headline; ChatGPT served me ads a few weeks ago.
I was asking it what type of Teflon tape to use for a project, and it "helpfully" gave me sponsored links to purchase the Teflon tape. (I never asked for links, I strictly asked it which to use)
I've only used CrapGPT a few times but if it starts working advertising into its responses (no ad blocking possible I'll assume), then that will be all I ever used it.
I was asking it what type of Teflon tape to use for a project, and it "helpfully" gave me sponsored links to purchase the Teflon tape. (I never asked for links, I strictly asked it which to use)