GTA VI has been officially described as a paid release

https://null/Fans-interested-in-gta-vi-free-download-can-legally-access-free-Rockstar-provided-wallpapers-traile-39f50a5fead38039881efcb19e496ab4

GTA VI has been officially described as a paid release, so any gta vi free download claim for the full game would not match the verified Rockstar sources.