If you look up gta vi free download, the verified details show the game is a paid release

https://juliet-wiki.win/index.php/GTA_VI_free_download_na_konsolach:_jakie_platformy_s%C4%85_potwierdzone%3F

If you look up gta vi free download, the verified details show the game is a paid release, while only promotional assets like wallpapers and trailers are available for free.