The usual term for this is <i>Goodhart&#x27;s Law</i>. From <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Goodhart%27s_law" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Goodhart%27s_law</a><p>&gt; Goodhart&#x27;s law is named after the economist who originated it, Charles Goodhart. Its most popular formulation is: &quot;When a measure becomes a target, it ceases to be a good measure.&quot;