What is a treasure island?

Its an island with lots of AC items like an open air free market, just bare in mind they r controversial sum peeps love them, sum hate them an think it cheating or dangerous. It won't let me fully explain them 2 u it keeps deleting my posts, u might want 2 google it

It's when ever someone mods their switch so they can have ever single item on their island, then they open it to the public people take the items of materials for free

Thanks kitcat u explained it much better than me 😊

And a possible way to find "bugs" it seems. Or is it all coincidences. 🤔🤷‍♂️