Better bandwidth is not a function of number of users, but of what you want to spend per user.
I don't have personal experience comparing the qualities of Skype vs FaceTime, but I guess Apple is willing to spend more per user. That makes sense: FaceTime sells hardware, and that brings in money, while Skype seems more like a land grab, especially with this 'group calls are free, too' change. It could also be defensive, with Microsoft thinking they have to offer this to prevent would-be Office 365 users from migrating to Google docs.
I don't have personal experience comparing the qualities of Skype vs FaceTime, but I guess Apple is willing to spend more per user. That makes sense: FaceTime sells hardware, and that brings in money, while Skype seems more like a land grab, especially with this 'group calls are free, too' change. It could also be defensive, with Microsoft thinking they have to offer this to prevent would-be Office 365 users from migrating to Google docs.