Dumb title but it was a great movie.

Clickbait article.

The idea behind Godzilla: Minus One as the title is to indicate that Japan was at zero - the country's lowest point - after World War II. From being on the opposite side of the war to the Allied powers of WWII to the nuclear attacks on Hiroshima and Nagasaki, Japan was in an incredibly dire state in the 1940s. In the film, Japan's restructuring as a country is worsened immeasurably by the emergence of Godzilla and his subsequent attacks against the country, hence the title of Minus One as Godzilla's wave of terror takes the country below zero>