I’m not sure you could exactly call it brainwashing but Josefina Rivera was able to gain the trust of her abductor enough that he let her visit her family. As soon as she was free she called the police which led to his arrest and the freeing of the other abductees.

https://en.wikipedia.org/wiki/Gary_M._Heidnik?wprov=sfla1

I feel like it punishes real people more than bots. An exponential amount of clicks is easy for a bot to achieve.