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No. That is fictive market cap according to last price of token... If you make cryptocurrency with 1 million coins and you sell one coin to somebody for 10 USD then market cap of your cryptocurrency would be 10 million USD dough only 10 USD are invested...

That's exactly what I was thinking. So we can't precise determine how big the crypto markets really are in terms of USD value being really invested in it. Or is there another way to find out?