Nothing inventive, not even an attempt to make it look legit. "Successful trader will make you 50% in an hour". "BTC refund department". "BTC doubler". And dozens of others so obvious one has to be a newborn baby to fall for. I wouldn't be surprised if soon there will be messages from "BTC Support Department" or anything along these lines. How can anyone sane fall for this?
Nothing inventive you say ? No they are but you may have become use to such lines and wouldn't waste time to take to your heals when such lines are given to you.
If you are in the space with the high taste for getting rich quick, you will fall for such. If you fall once then there is possibility that you may not again except the person is extremely greedy. Most culprit here is the newbie who are totally new to scam because they believe totally what they see on the space but they never knew it is the more you look, the less you see.
Personally, I don't consider doubling money from somebody that I didn't work for or make contributions to his or her life. I consider if it were possible for him or her, then they would double their money by themselves but you see someone falling for another person's trap of scam even when it is clear .
One big reason people get scammed is greed. When you want to double money with someone, you just know it is not possible.