I hope this resolves soon. Using the minus button is safeguard as well for those who are getting scammed. So far, I did this because I (stupidly) open my island to all my "friends" in my friend list even though I'm only inviting one and thinking that its just proper etiquette not to go to another person island without their permission. I was wrong.
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Anyway to make long story short, the minus button is very essential safeguard to the online economy of the game. I do hope we have some more news soon. I don't want anyone to lose their islands.