Nintendo is always in a fight against hackers and dataminers, and the latest battlefront is Animal Crossing: New Horizons. While hackers have already made a decisive blow, Nintendo has countered with their own efforts.
In just a couple of days, hackers not only found out that save data is encrypted in Animal Crossing: New Horizons, but they also created a tool to decrypt the data. Nintendo obviously isn't happy about this, as they encrypted save data to prevent cheating.
It seems as though Nintendo knew this was going to happen, which is why they've added in some new protection measures in the Version 1.1.0 update. This update includes anti-cheat measures, which means any cheaters that go online with manipulated save data could end up being banned. Not really worth the risk, is it?!