There is no Yu-Gi-Oh Season 0
Toei Yu-Gi-Oh 1998
This is no season 0 because it was animated by a different studio. Just call it Toei's Yu-Gi-Oh, you know, the guys that bring you Kamen Rider and Sentai? Look, Kaiba has green hair. It's not the same continuity! The reason we're able to fansub this series is because this isn't the anime that was licensed and dubbed in America. It aired in 1998 and is referred by the Japanese as Yu-Gi-Oh anime series 1, since it was the first one. These details are important.
Yu-Gi-Oh Duel Monsters
This is the series that was dubbed for America. It was created by Studio Dais and owned by TV-Tokyo, but the important thing is that this is the successor series airing in 2000, that's why it has the extra long name to distinguish it from the original.
Like don't start calling Duel Monsters Yu-Gi-Oh season 2 or something retarded like that, but stop fucking calling the Toei series "Season 0". It makes you sound super ignorant. You can call it Toei Yu-Gi-Oh or Original Yu-Gi-Oh anime series, but it shouldn't take a diminutive because of some North American familiarity bias.
TLDR: Stop using the term "Season 0" this is a Japanese fan site. It's the same reason we don't let people use Power Ranger terms for Sentai