Once again: ICANN has absolutely no influence on the operation of independent DNS servers. If they want they might put them on a blacklist and ban them from the DNS tree. But the direct access over a browser plugin or a direct entry in the DNS settings would never be affected from an ICANN ban. Only possibility for a government would be to advise the ISP to disconnect the DNS server. If you're operating several servers at several locations you're independent from any government - until they get it to advice or control all ISPs of the world. This would be a hard job…