The FSF has had this 1987 newspaper article on their web site for a long time:<p><a href="https:&#x2F;&#x2F;www.gnu.org&#x2F;philosophy&#x2F;motivation.html" rel="nofollow">https:&#x2F;&#x2F;www.gnu.org&#x2F;philosophy&#x2F;motivation.html</a><p>There&#x27;s also a psychology experiment in which people who were paid to argue for a position reported less belief in it afterward compared to people who argued for it for free (but I don&#x27;t remember the citation). Apparently all of these things may be described as<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Overjustification_effect" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Overjustification_effect</a>