Jehovah`s Witnesses say they have preached in the entire earth which is a blatant lie.As you say they are banned in Singapore ,North Korea ,Saudi Arabia ,and are severely restricted if not banned outright in many other Muslim Countries and certainly cannot do any D2D preaching.I dont believe they have the freedom to go D2D in mainland China either which has a huge population ,nor Pakistan or Bangladesh .
These countries must amount to about a third of the earths population at least ,so its a lie to say they have covered the earth with their witnessing.