None of these methods are new. In fact these are some of the oldest methods to scam people on the internet dating way before bitcoin was created. They rely on people's greediness and how some people trust anything they read on the internet specially if it is promising them big returns.
You also missed on of the stupidest ways where they tell you that you've won something big but in order to receive your prize you first have to make a deposit to cover the cost of them sending you that prize!