For those of us who had plans to set up multiple islands in Animal Crossing: New Horizons, Nintendo has actually put a limit on that kind of insane fun. With the announcement of the new Animal Crossing-branded Nintendo Switch, some folks caught wind of the section you see below from the official game page on the eShop. As it outlines that you can have multiple people come and play on your island, however, there's only one island allowed per console.
So basically, when you invite friends to your island in Animal Crossing: New Horizons, make sure they can be trusted. Because like the planet you're on, you only get one.