The Microsoft versus Facebook comparison is not apt. Facebook takes something like a 50% cut of the money made by Zynga with their Facebook app. Microsoft did

The Microsoft versus Facebook comparison is not apt. Facebook takes something like a 50% cut of the money made by Zynga with their Facebook app. Microsoft did not create a walled garden so did not have the opportunity to charge for running on their platform. Software as a service and (to a lesser extent) the various app stores are different. The incentives are not the same.