Government can make regulation to collect taxes from bitcoin trading. Every trade we made in market will put taxes by government. I think Ethereum is not a ponzi scheme because its already recognize as digital asset in several country
I definitely agree, about Eth is not a Ponzi scheme because they are already been established and proved to be so much useful especially in ICO's. Furthermore, crypto adoption is getting more interesting because some countries are already using the services and hopefully in the future, we can witnessed a broad and wide adoption.