One might think a banner that only slightly shrinks the screen would seem a less intrusive way of delivering ads than full-screen ads, but I'm finding them more annoying. Their frequency combined with their commonly using a white background creates a huge contrast between the often-darker backgrounds of the stream. I.e., they're an eyesore.

I suggest advertisers be required to also provide a "dark mode" version of their banner. Let viewers toggle their preferred mode in account settings and additionally provide a checkbox to toggle the mode whenever a banner ad is displayed.