US citizens or residents can't invest in SONM? Isn't SONM going to be on bittrex? How come US citizens/ residents can't buy in the crowdsale but you can buy in bittrex if it comes in the exchange?
Polo is US as well and look at all the ETH tokens.
The restriction only applies to the crowdsale itself as the organisation doing it doesn't comply with the US laws.
It will be on exchanges after the ICO.
Thank you.