Skype
Microsoft owns Skype now, so it’s no surprise why it’s on XBOX ONE is already on the wave leaving PS4 way behind. As of terms of their acquisition, Skype is within range of being open to other developers so it would be in their best interest to offer it on a plethora of devices. Make the experience better on XBOX, it doesn’t matter. As long as it is open to Playstation users. Don’t monopolize Skype, MS.