If you call bitcoin a pyramid scheme you might as well call Amazon stock, hell all stock in all companies, and of course SSI and pension funds across the board, pyramid schemes. You are equating anything that requires increased participation for growth in value a pyramid scheme.

Welcome to planet earth 21st century. It's all dependent on that.

If you would differentiate it from your run of the mill gifting circle or productless MLM, we would probably appreciate your point. Otherwise you really have none.