I was trying to read it on an iPhone using Safari. The mobile "experience" is way, way worse compared to that on a big screen. At least two thirds of my screen estate were blocked by popups and that's how the vast majority of (mobile) users are going to experience it as well.
it auto-closes sign-up popups and cookie prompts ?
I just checked again (on mobile). It does show the sign-in prompt (was just less obtrusive on desktop). It doesn't show app prompts or cookie prompts.