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Capitalism is nothing but a giant pyramid scheme.
(infosec.pub)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. The best ones are thoughts that many people can relate to and they find something funny or interesting in regular stuff.
It's used so interchangeably these days that I'm inclined to say no, but an oversimplication is that a ponzi scheme is always illegal and is more detailed in its mechanics (as named after conman Charles Ponzi). Wheras a pyramid scheme (or more commonly known: MLM) can actually be legal depending on how it's constructed.
A ponzi scheme involves a conman who scams his customers by taking massive profits from their investors and requires a constant stream of new investors to pay off the old ones. This is fraud.
A pyramid scheme usually involves some type of product and pays huge bonuses to the recruiters at the top for bringing in more people below them from the investment of new people below them. This is taxing uneducated people but can be legal.
TLDR: capitalism is more akin to a pyramid scheme and not at all like a ponzi scheme.