Most of the time Pyramid Scheme is not really worth investing in, And in a blockchain technology it will just turn out to be a ponzi scheme because a pyramid scheme always refer to pyramid scam and a business model that recruits member and promising them that they can get an income when they reach a certain level which is true, but as the number of participants multiplies and had congested the system it is nearly impossible for newly member to recruit some more and that is why some member is unable to profit because of it, And this kind of Scheme is unsustainable and illegal