This is how the story starts and I can tell you that it will end badly for one of the two person involved in it, care to guess to whom? Cease all communications with such user, block it and report as spam/scam. Then take it as a lesson learnt - There are no free lunches[1] in life and such approaches are one of the many ways that people all over the world get scammed daily.

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[1]https://en.wikipedia.org/wiki/No_free_lunch_theorem