Greed costs dude, BT is a ponzi , a smart one, but its a ponzi 
How is it smart? I never seen a more obvious ponzi, and Ive been around the block(chain), ive seen lots and lots of them. None where so blatantly using all the tricks in the book. I mean.. all the social networking reach out ? using referral links? Really? What legitimate insanely profitable venture would be so desperate for more funds that they set up an elaborate referral scheme? The only thing they didnt do (or maybe they did) was cold calling from a Bangladesh call center. The "smart" ponzi's actually made you feel special that you could even invest in them. They pretended it was a rare privilege.
It's a smart Ponzi because it convinced people to invest, telling them that it was not a Ponzi. Telling from the company, it has been successful. Not everyone can tell that it's a Ponzi, or else it wouldn't have been nearly as successful.