The triumph of Apple’s walled garden

Horace Dediu for Asymco:During 2016 Apple services revenues were $25.6 billion… If, as has been the case during 2017 and 2018, Apple were to maintain 30% growth in Services during the rest of this year they will have revenues of $51 billion in 2019; reaching the doubling tarted a year sooner than predicted.
Apple will have doubled Services in 3 years to a level equivalent to a Fortune 63 company (right behind Goldman Sachs).
Keep in mind that the reported revenues are not billings or what