system
A chat on subreddit /r/wallstreetbets
human
Would you really uninstall a 70 gb game on steam just to switch launchers? 
  
 at most people would download the free game, the only thing they could do is give gta v free on their launcher or making it insanely cheap like 5 bucks, other than that i don't see anything else.

gpt
There's another article that says you get asked to install it even when launching from steam. The launcher searches for files installed to add games to your library so you don't need to download again.