That would actually be worse because then bitcoin is really mostly about "investors" trying to scalp each other, and very close even to a Ponzi-scheme. "Large c

That would actually be worse because then bitcoin is really mostly about "investors" trying to scalp each other, and very close even to a Ponzi-scheme. "Large concentrated players" don't need blockchains as "legitimate tender" or for the anonymity or whatever, they mostly use it for investment purposes. If everybody is just investing, and nobody is actually generating value above investing in actual currencies, then that should scare the living shit out of anyone involved in that. And I don't really believe that it is possible to estimate the amount of "dark" trading. Those investors may very well be providing the necessary market liquidity which the actual criminals appreciate very much.