Among other things, Microsoft claims that their purchase of Activision Blizzard will give us “More games on more devices including Xbox, Playstation, phones and online”. They also say it would be beneficial as it would offer a “Choice in how and where people buy games with subscription and one-off purchase options”, since Activision Blizzard’s titles would be included with Game Pass.

It also seems that Microsoft wants a piece of the mobile gaming market, probably with Xbox Cloud Gaming, as they will try to offer an alternative to the App Store and Google Play. They list this as a player advantage and write: “For the 95% of gamers who play on phones, alternatives to gaming offerings from the dominant mobile platforms”. They also list this point as a benefit for the entire industry: “More competition in mobile, where a couple of big players dominate”.

Source: Microsoft