I still don't understand what "Denying access to the SDK" is supposed to mean. Aren't the iOS and Mac development tools free to download without a developer acc

I still don't understand what "Denying access to the SDK" is supposed to mean. Aren't the iOS and Mac development tools free to download without a developer account? Isn't publishing on the app stores the only thing that not having an active corporate account prevents? Apple haven't said that they'll block anyone using Unreal Engine, right? I thought this was just about signing keys, in which case other people using the engine should be fine... In fact, does anyone else who deliberately tries to sneak things past the review process get to keep their developer account _and_ the offending version of the app available? Couldn't this just be Apple going "see, we treat them the same as everyone else"?