Normal people aren’t downloading a 100GB torrent to get this working. Nor would they setup an emulator.
At most less than half a percent of the target market would actually do this.
Still, I’d imagine Rockstar easily being able to sue anyone in the US who tries to play this illegally. It’ll probably just stick to Russia where buying a PS5 is basically impossible anyway.,
You underestimate the will to play gta 6 by people. Necessity is the mother of invention. GTA 6 on pc as a possibility is literally why this project gained attention.