as long as you can only buy crypto with fiat you avoid all those issues. I see no reason it should be any other way.My only concern is if other stocks, hedge funds, commodities are linked to crypto currencies. These can fluctuate a lot within a short period of time without warning, as some have already said. Some analyst s have suggested a crash or a bursting of a bubble, and if cryptocurrencies' trading are deeply interwoven in stockmarkets, that would have severe repercussions. Not that regular stocks are not prone to crashing, but given the highly speculative nature of the crypto currencies' trade at this time, it could precipitate the markets into chaos faster, without warning or reason. Measures should be put into place to prevent that. If so, then by all means let people do as they please with their money.