Through the Master Chief Collection, a range of Halo titles were made playable on PC. However, these titles weren't the main competitive focus, which for many years, has been centered around Halo 5: Guardians. Although, when Guardians launched, it was exclusive to Xbox One, and by 2021, it still was. It was confirmed that there'd be no plans to bring Halo 5: Guardians to PC, especially with the launch of Halo Infinite rapidly approaching.
But, Halo Infinite itself was confirmed to be a multi-platform title, being launched on both Xbox consoles and PC. Furthermore, developers 343 Industries explained that Halo Infinite would be cross-platform, with players on both Xbox and PC platforms connecting with one another in-game.