For those who want to invest in ICO from USA or China, they will find their way to do it. VPN or any other solution 
Indeed they do
We offer a brokerage service for exactly such cases.
VPN's are not always helpful, especially when the ICO has 'KYC' in place.
With very hot ico's like ChainLink (LINK) coming up, we are getting quite many requests from investors all over the world.
Visit our website for more information: http://icobroker.trade/
If the ICO you are interested in is not listed, send us a e-mail and we will look into it right away.