You might get into real trouble and it is not worth because it is hard to find really good ICO project that you could trust 100 %
So it might happen that you take double risk:
- ICO scam
- infringement of US Laws.
Why don't worths? The dact that there are many scam ICO's doesn't means anything, also you can never trust any ICO 100%. But this is a great way for creative and profitable investment.
We can use VPN anytime and everywhere, it's not a problem if we want to bypass something, even personal information (if it's not a bank directly).
Also I agree to pearlsome, just buy coins when they will be released, paying some % more worths for absolute safity.