I am a Nigerian Prince, and I'm about to come into some wealth, but in order to access these millions of dollars, I need you to give me a small amount. ($10k) If you do, in exchange for your kindness and help unlocking my assets, I will immediately pay back your investment at 10x ($100k).

People consent to giving people their money all the time, and it is still illegal and immoral if the person offering deceived them. OR maybe you're a phisher and you think there's nothing wrong with phishing...