Regardless as to whether Eth is currently overpriced, real people pay gas fees to the Ethereum network to use the services it provides. And regardless as to how you feel about value of those services, to those people who are paying those fees, those services do have value.

In other words, the price of Eth is derived in part from real demand for the use of the services of the Ethereum network. If speculative interest in Eth were to completely collapse, its price would not go to zero, because demand for the use of the Ethereum network would sustain it.

I imagine that you would argue that demand for Ethereum network services is itself driven by pyramid schemes, and is therefore inflated. Perhaps. That does not mean, however, that Ethereum itself is a pyramid scheme. And certainly not all of the demand for Ethereum services is illegitimate.

A pyramid scheme requires that cashing out of one's investment depend on new investment money entering the scheme. It is not unreasonable, however, to purchase Ethereum with the hope that the price will go up because it will need to be purchased by users of the network, who will pay higher prices in the future when demand for the network's services goes up.

You can disagree with this proposition without calling Ethereum a pyramid scheme. Just because you think Eth is a bad investment does not necessarily mean that it is a pyramid scheme.