Obviously, Because the United States is not friendly to ICO cryptocurrency, especially for regulatory reasons. To put this in perspective, the United States is quite strict when it comes to investment regulations. Only accredited investors can take part in the placement of personal securities.

A lot of ICOs take the necessary steps to “deny” US citizens from investing. If they do not take these steps, all sales of their tokens will be subject to criminal charges in the US. That is, assuming the SEC would decide to investigate certain Crowdsale for these specific reasons.