I thought it was a sign of who paid for the feature. I have no insight as to whether or not this is true, but leaving out S3 made me assume either Google or Mic

I thought it was a sign of who paid for the feature. I have no insight as to whether or not this is true, but leaving out S3 made me assume either Google or Microsoft (or a third party heavily tied to one of these clouds) paid for this to be added.