There has always been churches that made false predictions for Armagedon. But I challenge you how many TIMES did Witnesses say the end was here? 15 or 20 officially in the publications anyone know? One rarely known one was 1942 Rutherford's book "Enemies" explained that Facists would soon start Armageddon.
Are Witnesses guiness book of records most false predictions Armageddon...yes!
I once read a book entitled "The History of the End of the World." Oddly, JW's were not mentioned. The funniest story was about a "cargo cult" on some South Pacific island. They noticed that the English didn't do any work, but sat at desks writing on paper, and, somehow, that made the ships come with supplies. The natives tried everything they could to imitate the English, sitting at desks, sometimes with flower vases (which they believed might have some magical power), writing illiterate scrawl, but to no avail. Finally, they got representatives to go ask the English their "secret" because they had been Christians for many years but had no luck making the ships come.