A non-existing one, you go to your settings to enable it so they can track you.

There are more or less annoying prompts however. With the later kind I could coexist.

Instagram has the most annoying one ever, if I stumble upon it by accident I am so annoyed that I need to count to 10. And I am not even using it, its just random click

The far less annoying popups are barely noticeable and do not block/fade content or have missing options like "NO, I don't want cookies, let me in".