I don't understand how easily they disappear with people money. We should report to moderator.
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How would moderators help? There's nothing you can do. Not even police can help you with this. It's way too gray legally if they even broke the law. Technically they delivered a product and just quietly faded away, probably because lack of funds. Even if they malice intentions all along, it would be hard to prove they had planned this from beginnig.