[rpmcmurphy]

A substantial percentage of the US population installed that "cow clicker" app at some point, and who knows what data they harvested. Even if they did not access your full profile, they could probably learn a lot about you based on when and how often you were clicking on cows.

[whatever_dude]

While your point stands, Cow Clicker itself was unlikely to be doing something nefarious. It was created specifically as a criticism of similar game mechanics, and got viral mostly by accident.

https://en.m.wikipedia.org/wiki/Cow_Clicker

Hence why the researcher who created it decided to kill it.