Earlier quoted context omitted.
They're not a MLM because there isn't the "pyramid" aspect. If I buy bitcoin at $10 and sell it to you at $100, then I don't get a percent of your sales going forward or anything like that. It's a plain old bubble.
That's not what makes MLM a "pyramid". Residuals are part of lots of legitimate business. What makes most MLM a pyramid scheme is the fact that growth is predicated on bringing new members into the scheme, rather than existing members growing their business.
All asset appreciation is predicated on increases in demand for an asset. Asset appreciation isn’t a pyramid.
Pyramids have no source of value - even an ephemeral asset - just dues of new members being channeled into revenue for preceding members.