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Because they count on the fact that transfer rate is so slow people will really realize this too late. I guess this kind of business create an account on amazon, aliexpress and others, scam thousands of users for a month or two, close their accounts, create a new one before they get annoyed by disputes and everything.

and might be able to get the boards cheaper, if they are old stock left over and easy to hack. then why not

Maybe this is built on an existing, legitimate product that require both slots to be populated to work?