There is probably a reason for that... The guys are in Europe, not the US, so they are more likely to attract euro investors.

Second, most people that invest in these types of projects rather use the anonimity options of the cryptocurrencies. Remember, after 1000 eur/usd you have to send proof of ID. In addition, your bank account number is known to them.

Don't think it is a negative that no USD is invested.