Refers to whatever methodology is used by the investigator, as long as it seems fair and accuate. (People who care about charity leaving the platform and also being better predictors is not a confounder; that's an acceptible cause of a decrease in accuracy that would resolve this market YES. However I would like it to account for other things like a greater user base due to a new community joining.)

Resolves NO if there is no change or an increase in accuracy.