"The United States of America:
The U.S. citizens and residents could participate in ICOs, but there are novel regulation rules for that.
Participation of U.S. citizens and residents in eHealth First's ICO is not prohibited by the Securities and Exchange Commission ("SEC") or U.S. law. However, despite the recent investigation of The DAO and SEC Report No. 81207 ("SEC Report"), establishing the status of an Initial Coin Offering ("ICO") as "securities" subject to regulation under U.S. law, ICO investors are uncertain, especially with respect to ICO's offered by foreign companies, such as eHealth First.
Basing on the review of the U.S. current legislation, the eHealth First Project Team considers, that the EHF Token isn't a security.
Nevertheless, eHealth First makes no promise of compliance with SEC regulations with regards to this ICO. Although eHealth First fully believes in the innovation and success of this project, it advises all potential investors that ICO investments carry certain risks and uncertainties. U.S. citizens and residents seeking to invest in this ICO are urged to independently assess all emerging risks. We provide the Guide for U.S. investors to help foster understanding of the current legal status of ICOs in the U.S., specifically ICOs offered by foreign companies, but we are not providing legal advice on this subject."

Saw this on the website. Are you suggesting US citizens can legally participate in the ICO should they understand that it is not an IPO equivalent of cryptocurrency?

Basically, yes. If the token is not a security token, technically, the above mentioned rules does not apply, but since many countries still don't have clear rules about cryptocurrency in general and ICOs in particular, investing in ICOs still represents a risk, especially in America.