https://finance.yahoo.com/news/apple-needham-buy-162422356.html

Free and paid Apple services including Apple Pay, Apple Music, AppleCare+ and Apple Books double the value of each Apple user over the years of their ownership of a device, with each user expected to spend an average of eight years inside Apple’s ecosystem, according to Needham.

Apple’s services business brought in more than $10.9 billion during its fiscal first quarter 2019, setting records in “every geographic segment” Apple CEO Tim Cook said.