I dont think that bitcoin is a financial pyramid system or something like that. It is a new technology of money. People who belive in blockchain technology they invest their money yes but I dont have alt-members or I dont earn money from them. It is like investing your money on a promising project or company.
I agree. The way it has started and had risen in power and value do not conform with your usual pyramiding scheme. Also, in its decade-long existence, there was no person who had ever claimed that his or her money was scammed from him by an "up-line" member, which is a usual ingredient found in pyramiding scams. Although it employs crowd-funding strategies in its investments, it doesn't follow a pyramid-style business plan because it's more of a loan-style scheme, where you lend your money to a starting up company, and it uses such money for capital. Also, its rise in value was due to investments.