Yes.[1] We're probably approaching the point where the SEC will do something to make ICOs do the same things IPOs are required to do. All they need is a good case. Look for "I put X into token Y because they said they were going to do Z. They didn't do Z, and instead, the people behind Z are buying yachts. And we know where they are."
Note that Synthorn has absolutely no contact details available (and an anonymised whois) except an address to send them Ether. They have a promotional Facebook and Twitter, I suppose the SEC could subpoena them ...
[1] https://ftalphaville.ft.com/2017/09/04/2193198/paris-hilton-...