You are describing Google Ads right now. Algorithms are better and better in reaching to poeple that are already on the purchase patch. It’s like giving a restaurant flayers to people that are waiting for a weiter to show them a table.
Aren’t our ads amazing? Look, almost everyone who saw them made the purchase!
Analytics that ignores Goodharts law ruin everything. Movies, HR, Marketing (not much to ruin left, but you get the point), performancet review, recommendations…
A similar case was with scans from “mobile scanners”. Since those are used on patients to sick to be transported, their cases were disproportionaly “malicious”. Model was effectively optimozed to detected if scaner was stationary or mobile.