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Is it really that obvious? I mean, they could charge even higher fees with fiat or other currencies than BTC and still don´t do it?

Traction of a coin is normally the factor, so like kwr already trades and they do like 100million in trades daily because of the fee's they most get. Its competitive to list in kwr. So if usd or eur gets listed in a decent exchange it will quickly popup elsewhere.

I want to believe, but I´m wondering why no one has tried this before, since this isn´t technically a big change and what can they loose? Isn´t it more because the moment you let people deposit fiat, they are falling under strict AML regulations and would need banking licenses etc?