Are US residents allow to participate in this ICO?
idk why they would not be allowed
This is a big project it will all depend on how it will be valued by the SEC in the US.
Most ICO's now ban all US residents due to all the SEC uncertainty.
banning US residents will be a huge downside for ICOs, for this community, So hopefully it won't happen like said in around.
All too often this is the case (US residents getting excluded) so I wouldn't be surprised if it happens here. There is often just too much risk for a project to delay/jeopardize it in the event of any SEC class action.