Following the publication of two unpatchable exploits and a hacking tool for installing pirated games, Nintendo is implementing security measures that will ban any gamecard that does not return the right certification data for online play. It appears that illegally obtained games would still work offline, however.



It is quite easy for Nintendo to detect when a game is being shared. Nintendo can verify whether the device ID associated with the certification matches the device ID for the device that’s trying to connect. If they aren’t the same, then it results in the game being banned from online services. In addition, these certifications cannot be forged.

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Source: [H]ardOCP – Nintendo Now Permanently Banning Switch Users with Illegal Games from Online Play