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Luna-App
Homebrew App to dump Animal Crossing: New Horizons islands you visit. Now using on-device De- and Encryption!
It's certainly possible - maybe even probable. I've found this program you can run on hacked Switches to allow preprogrammed inputs. This is useful for Tool-Assisted Speedruns (TAS), which can press buttons faster than any human can. It's possible that the same technique could cause Animal Crossing to glitch out.
Another way would be an evil version of something like this. That one uses the program I mentioned earlier to hack Animal Crossing specifically. What this does is work much like an Action Replay - when you're going to drop an item, it detects it and overwrites the item you're dropping as you're dropping it. This lets you drop items you don't have in your inventory, or things you can't normally drop.
This one downloads someone else's island to your Switch. You can effectively make an exact copy of their island, and then you can replace your local island with a copy of that island. This means if you found an island you really liked, you can copy it and make it your own. This even works when visiting someone else's island over the internet.