With only increasing regulatory scruitiny, it is more likely than not that bitfunder and haverlock will go the same way as btct.

Havelock is in Canada where regulators have given bitcoin a pass. All they need to do is make an attempt to dissuade U.S. citizens from investing.

How can you do that without asking for identification verification and noone will want to give that out

isn't it enough, from a legal point of view, to block USA's ip addresses?

Unclear, it is up the discretion of the SEC and FinCen. It is trivial afterall to bypass blocking US IPs via Tor or VPNs.