I think you're not trolling, but I'm not sure. The first thing anyone smart does when they make a metric is think about what rules or other measures have to be

I think you're not trolling, but I'm not sure. The first thing anyone smart does when they make a metric is think about what rules or other measures have to be in place to prevent obvious gaming of the metric to the detriment of the real goal. When this is done at scale to markets it's called "regulations." Markets are not even a little Goodhart proof.