Why is Roblox not on the alienware ufo?

So unlike PlayStation own by Sony and Nintendo Switch own by Nintendo. Alienware Ufo is owned by Alienware and it is own by dell you guess it dell is own by Microsoft which a special deal with Roblox only allowing it consoles to played by Roblox. Since Alienware Ufo is owned by Microsoft technically why is Roblox played on their.[this is a image of Alienware Ufo]