Remember when the RIAA/MPAA was going after college students for downloading shit? Pepperidge Farm remembers.
A really fucking thing happened during the Napster days though. Music revenues INCREASED. Because as it turns out if you turn out a quality entertainment product, even offered for free, people want to buy more of it and buy things related to it. They discover more bands and more genres and listen to more of it.
The only correct response in these cases is for you express a hope that the people who did obtain your work without paying enjoyed it, and if they enjoyed it, hope that they'll consider purchasing their own copy or some of your other work.
(again, as you said, there is zero chance that the people who read Cuck Wendig's work enjoyed it, so throwing a screaming tantrum about 12 people reading his shitty books is his only recourse.)