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Stranger in Asia wants to send me $3000 in Europe over Western Union because he “likes me”? [duplicate]
It can be a money laundering scheme. The stranger gives you cash for free at first, then proposes to give you more but this time asks you to "spend" a fraction of it (like 80%). So on his side the money comes from a legitimate source.  So you do it because after all you get to keep the rest of it and it is "free" money. But you are now involved in something illegal.  Having money for which you cannot tell the origin is also something highly suspicious. You will not pay tax on it, and the fiscal administration of your country might give you a fine. Customs might also be able to confiscate the money if they suspect it comes from an illegal source.