You have a good point. As long as that fear is in the used games market, people will be incentivised to only buy new cartridges (if not digital) as they can’t trust any used ones. The only sales then would be between people who know each other and are swapping their games, which is a far smaller market. It is somewhat ironic that the MIG Switch, a device made by people who have nothing to do with Nintendo, might end up helping Nintendo revenues by making it so that nobody can trust that used games weren’t cloned.