If you want something interesting to research about this, I am pretty certain OneCoin is still running in the public space in a few countries.  One of them is Romania.  Look up OneCoin Romania and they are still there, up and running.  At least, they were a few months ago.  Whether they are the main branch and initial scam or a new attempt by a smaller group, I have no idea.

Anyway.  I remember the woman running the entire Ponzi scheme was a Russian who is now on the run, am I correct?  And this is one of, if not the biggest cyber scam ever.  They had no real currency, they just stole money.  Yes, maybe we can call that a 'market cap' of a nonexistent coin.

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Regards,
PrivacyG