vexing
As you pointed out, we're a company. That means making money to defend against lawsuits, paying employees, etc.
It's not blackmail though, because as it was also pointed out, most websites join for free. No strings attached. Well, the strings are that the ads they want to display need to meet all of the Acceptable Ads criterias, which we found most users don't mind.
That allows us to find a middle ground between "we're drinking all the beer and pay nothing" that other, more scorched-earth-like adblockers go for, and the "oh gods my eyes"-design some ad-bloated websites go for, which no one really wants.
From a publisher perspective, we're not the evil guys either. We're not reducing anyone's revenue, we're allowing publishers to recuperate some of the losses caused by the user's choice of opting out of really annoying ads.
Hope this made sense!