Cool, what does this have to do with Filecoin, their ICO, and Ponzi schemes?

A MLM scheme is that: a scheme requiring a central actor to pay commissions. This is why Bitcoin and decentralized currency has never fit this definition.

You could say there are some abstract resemblances (BTC bagholders encourage others to buy) but this is just abstract and not specific enough to fit the definition.

We've seen people run Ponzis using BTC, we've seen ICOs structured as Ponzis. However "Bitcoin is a Ponzi/pyramid/MLM" will never be true; not literally at least.