Because this isn't just about "making anything in return" any more than neo-Nazis are booted from platforms "just for having different opinions." More people are using adblockers on YouTube because YouTube isn't simply displaying commercial advertisements, they're pushing "ads" for scams, malware, and all manner of heinous and/or sketchy content. Even separate of that, the frequency of ads and the presence of minutes-long ads you need to manually skip have made watching content difficult and unpleasant, if not unworkable. Adblocker usage is as much about restoring functionality to the site as anything.

All of these issues have been raised with YouTube, but rather than address the complaints by adjusting how ads are selected and served they've decided the only solution is for you to pay them monthly, not just a few bucks but as much as (or more than) the major video streaming services. All of this for content they do not make, at a price point far beyond what they need to be profitable. It's greed for the sake of greed, pure and simple.