Funny how this is such a contrast to ROTW.
Worldwide Apple have long since lost their dominance: less than 28% according to Statcounter, with Android basically ruling the roost by a huge margin.
This is what happens when people are too quick to jump on the Apple-bashing bandwagon, and leave their critical thinking at the door.
There are 7 billion people in the world today. A comparatively smaller market share can still mean a ton of users in an absolute sense, especially when you consider the target demographic that Apple markets to.
Today, Apple has well over a billion active iPhone users, and this number continues to grow with each passing day. This includes not just iPhone sales, but also sales of 2nd hand iPhones (as current users upgrade their handsets), which further grow the user base, but aren't captured by official sales numbers. This is aided by iPhones having better build quality (hence better longevity), longer software support, and easy battery swaps via Apple Stores.
This is also a user base with the disposable income to purchase additional Apple products like apple watches and AirPods, as well as spend on apps and services. And because of the stickiness of the ecosystem, Apple users rarely ever switch.
Apple also dominates in the stats that matter. It's no small secret that platforms like Facebook and Google make the bulk of their revenue from iOS users, which gives Apple a lot of leverage over these companies (eg: ATT). The iOS App Store brings in more revenue that the Google Play Store (funny story - I am currently setting up an android tablet for my mom, and I have yet to find an android version of bubble shooter that isn't infested with ads; the iOS version at least lets me pay to get rid of them altogether), and tends to have the better apps (eg: Apollo, Tweetbot, fantastical, overcast, 1password, spark).
Profitless market share is the only metic that critics can use to make it seem that Apple is all but dominating the smartphone market space.