--- via Feedback, New Scientist, April 2025:
Feedback is irresistibly reminded of Goodhart’s law: the notion that, once you start using a given measure as a target, it stops being a useful measure. In this case, everyone is trying to make videos that get hundreds of millions of hits, so there are loads of videos with hundreds of millions of hits. It isn’t at all clear that any of those videos are, in any meaningful sense, good or useful. But they sure do hoover up advertising money that could otherwise be used to support popular science magazines.
From Wikipedia
Goodhart's law is an adage that has been stated as, "When a measure becomes a target, it ceases to be a good measure". It is named after British economist Charles Goodhart, who is credited with expressing the core idea of the adage in a 1975 article on monetary policy in the United Kingdom:
Any observed statistical regularity will tend to collapse once pressure is placed upon it for control purposes.
Goodhart, Charles (1975). "Problems of Monetary Management: The UK Experience". In Courakis, Anthony S. (ed.). Inflation, Depression, and Economic Policy in the West. Totowa, New Jersey: Barnes and Noble Books (published 1981). p. 116. ISBN 0-389-20144-8.
