I understand that you end up with a skinned webkit and JavaScriptCore - A few years ago I wrote bindings for JSC for a mobile game engine so that you could invoke native code from js in an ios app. That aside, my point still stands that they can not possible vet content on the internet, so why should they be able to apply this to streaming games also.

Perhaps netflix would have been a better example. Do they vet every piece of content netflix have, if not then they can't reasonably apply this to games.