Bitcoin is the opposite of a pyramid scheme from the point of view of Bitcoin miners. The Bitcoin protocol is designed like a cannibalistic arms race. Every additional miner prompts the protocol to increase the difficulty of mining. From a social point of view, Bitcoin is a pure market. The price of Bitcoins fluctuates based on market supply, demand, and perceived value.
I read the question again and again to understand and recall how bitcoin actually works and tried to relate with it but its not even close to being the pyramid scheme. The crypto currency or bitcoin for instance is just price tagged algorithm which can be sent over the protocol from peer to peer and transmit the values. Does that even seem to be related to it? May be that is just the operation of bitcoin. Okay let's talk about the bitcoin earning and spreading ways. Is there any offer that satoshi levied that those who will get most of the people on board will have X percentage from the bitcoin market cap. I don't think so and neither of them trying to do so.
In any sense this is not valid statement at all.