Sega and Microsoft have had partnerships before that people fail to realize. When Sega released Dreamcast, it was partnered with Microsoft. The Dreamcast used a Microsoft OS and it was stamped on every Dreamcast.
https://news.microsoft.com/1998/05/21/microsoft-sega-collaborate-on-dreamcast-the-ultimate-home-video-game-system/
I was Sega fanboy, so I know. 😒