https://variety.com/2023/tv/news/kevin-costner-yellowstone-exit-salary-1235711604/#:~:text=According%20to%20People%2C%20when%20Costner,that%20led%20to%20his%20exit.

According to People, when Costner was asked if he'd receive his salary for the second half of Season 5, he said, “I will probably go to court over it.” It was the Season 5 split, he said, calling it a “long, hard-fought negotiation,” that led to his exit.