The closest thing to a documented case I've seen is a report of people gaming the Time Person of the Year poll so that the top person was moot, and the first le

The closest thing to a documented case I've seen is a report of people gaming the Time Person of the Year poll so that the top person was moot, and the first letters of the candidates spelt out "Marblecake. Also the game.": By understanding how reCAPTCHA worked – the team was able to double their productivity (since they usually only had to enter one word instead of two). To further optimize their voting they created a poll front-end that allowed you to enter votes quickly while giving you an update of the poll status (and since it is a 4chan kind of crowd, they also provided the option to stream some porn just to keep you company while you are subverting one of the largest media companies in the world. https://musicmachinery.com/2009/04/27/moot-wins-time-inc-loses/ https://musicmachinery.com/2009/04/27/moot-wins-time-inc-los... However, this is slightly different as people were deliberately solving CAPTCHAs (and watching porn) rather than wanting to watch porn and also incidentally solving CAPTCHAs that they had no direct interest in.