> I can't see how you can build an anonymous system for transferring wealth around that requires significant bandwidth and CPU and not screw the planet by providing a service for drug dealers and terrorists.

I think you can accept that with any new technology there will always be bad actors using it, so this argument makes no sense to me.

There are also cryptocurrencies out there that are more efficient than others and solve the environmental issue, I just hope that you're not conflating Bitcoin, Ethereum with all cryptocurrencies.