Simple: for it to be a pyramid scheme there needs to be a pyramid, and there isn't one. With Pi, your referrer makes 0.025/hr. If you invite ten million people, your referrer still makes 0.025/hr. If you invite two people, and each of them invites two, and so on for fifty iterations, your initial referrer still makes only 0.025/hr, as do you. --There's no pyramid. Upon mainnet, the faucet shuts off and nobody makes any more free coins.

0.025/hr is a small amount that exists to provide some incentive to spread the word, otherwise there would be none (e.g., in a proof-of-work coin, you'd just keep your mouth shut because you don't want competition mining increasingly scarce blocks).

Simple: for it to be a pyramid scheme there needs to be a pyramid, and there isn't one. With Pi, your referrer makes 0.025/hr. If you invite ten million people, your referrer still makes 0.025/hr. If you invite two people, and each of them invites two, and so on for fifty iterations, your initial referrer still makes 0.025/hr. --There's no pyramid. Upon mainnet, the faucet shuts off and nobody makes any more free coins.

Simple: for it to be a pyramid scheme there needs to be a pyramid, and there isn't one. With Pi, your referrer makes 0.025/hr. If you invite ten million people, your referrer still makes 0.025/hr. If you invite two people, and each of them invites two, and so on for fifty iterations, your initial referrer still makes 0.025/hr. --There's no pyramid.

Upon mainnet, the faucet shuts off and nobody makes any more free coins.