They call it “dark traffic” - ads that are not seen by tech-savvy users who have excellent ad blockers.
Not surprised that its growing. The web is unusable without an ad blocker and its only getting worse, and will continue to get worse every month.
There are a couple of steps missing at the beginning. There was a time when we only blocked popups; other types of ad were fine, but popups were annoying enough that they needed special attention, and the popup-blocker was usually built-in to the browser without needing an extension. It took a couple of years for the non-popup types of ads to become obnoxious enough to warrant blocking.