ICANN is mostly a failure
They failed to wrest control of the dot-com zone back from Verisign, and have mostly tacked on additional fees on domain name registrations. Indirectly that means the Department of a Commerce has failed in its oversight. The organization is opaque and unaccountable (google "Karl Auerbach ICANN). There are a few bright spots like DNSSEC and IDN, but they are few and far between.
Putin, Erdogan, Iran or the Chinese Communist Party don't need control over ICANN to enforce Net censorship. The only question is about fighting for the gravy train.