Just because nobody knows you gave $50 to wikipedia, doesn't mean the reason you gave $50 isn't because you were asked to, and you've evolved to act as if it we

Just because nobody knows you gave $50 to wikipedia, doesn't mean the reason you gave $50 isn't because you were asked to, and you've evolved to act as if it were a public face-to-face transaction, your post-hoc rationalisation of it notwithstanding.