GTA 5 runs perfectly on Linux out of the box. So do all AAA releases. What are you basing your assumptions that GTA 6 won't work on? Have you even played games on Linux in the last 6 months?

Unless you're talking about GTA 6 Online, your comment makes absolutely no sense whatsoever. And if you do in fact mean GTA 6 Online - again, go to therapy and cure your addiction to predatory money extractors.