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

https://wiki-legion.win/index.php/GTA_VI_for_free:_jakie_informacje_s%C4%85_potwierdzone_przez_Rockstar%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.