Advent of Code does a great job at this. Its ads are text-based, relevant, and unintrusive. Of course, it has a pretty particular aesthetic, but plenty of sites

Advent of Code does a great job at this. Its ads are text-based, relevant, and unintrusive. Of course, it has a pretty particular aesthetic, but plenty of sites could do a simple (non-animated) image or text to surface their sponsor without being annoying.