What you describe could actually be an artifact of "flaw of averages" (an article was posted here just few days ago, TLDR: air force discovered that nobody fit

What you describe could actually be an artifact of "flaw of averages" (an article was posted here just few days ago, TLDR: air force discovered that nobody fit the body dimensions of an average pilot and therefore created adjustable seats for jets). If promotion banners are just segmented to general millions of people then that's exactly what will happen. But not sure if better segmenting is even possible with data available.