Without using a bias or metric, there is no way to filter a list of items. The only other option is randomness, and there is a notion of fairness to it, at leas

Without using a bias or metric, there is no way to filter a list of items. The only other option is randomness, and there is a notion of fairness to it, at least mathematically. Maybe the list could be 5 options chosen randomly. As long as number of users is several orders of magnitude over the number of choices, it could be considered as somewhat fair.