I don't think that Bitcoin is a financial pyramid, Ponzi scheme or scam. What I see here is a revolutionized virtual currency technology and in the near future, everyone will know, use and access it as an alternate payment, investment, saving, and/or purchasing transactions in a form of virtual currency.
yes, I agree with you, that bitcoin is not a pyramid system, but bitcoin is a digital currency that we can use as a transaction tool, making it easier for us to transact. there is no interest and purpose other than to improve the world economic system.