I think the emoji one is most pronounced in bullet point lists. AI loves to add an emoji to bullet points. I guess they got it from lists in hip GitHub projects.
The other one is not as strong but if the "not X but Y" is somewhat nonsensical or unnecessary this is very strong indicator it's AI.
I struggle to understand people getting butt hurt about a free service showing its users adverts, that will keep the service free.
They should have done this earlier, so their adds would be better by now, and they have a better chance against Google.
As usual just because Google uses it and seems to be successful with it doesn't mean that it will work for normal companies as well.
ChatGPT in theory has the potential to show relevant ads as there service involves the user stating what they want. So they could actually present relevant ads. We'll have to see how it turns out.