And yet, interestingly, developers removing their own apps is also Apple's fault in the end, for two reasons: one proximal, and the other ultimate. I work on an app that helps you bypass firewalls, and so it is illegal in China. I am pretty sure I would get in trouble with Apple if I allowed it to be downloaded in China, so I turn off the ability to download it in counties where I know I am not allowed to market it... if you thereby told me that every one of these apps was turned off by the developer, I would not be surprised.
However, more fundamentally: I also think we turn off the ability to download our app in some countries on Android... and yet I know that users can and do still install my app in those countries (hell: I want them to!!!) because Android almost always supports sideloading (and hell: the Google Play Store is often blocked in the most egregious counties anyway).
The real, underlying, ultimate issue is that, driven primarily by their greed, Apple has decided to create a centralized bottleneck on the deployment of applications to their platform, and so has--100% predictably: like this was ridiculously obvious when they started doing it what would happen, and they certainly are not so stupid to not now know in hindsight... they just don't care--become a tool of oppressive regimes to block and enforce the installation of software they dislike on people who happen to own an Apple device.
For a much wider and more general analysis of what is going on here, I highly recommend watching a talk I was giving a few years back called That's How You Get a Dystopia--the best version of which I did at Mozilla Privacy Lab (recording link below)--wherein I look at not only Apple, but the harms put upon users from centralization across the software industry, as well as discuss all the ways this also screws us even in counties that supposedly are quite liberal (as if nothing else, Apple is specifically extra-puritan, which causes a weird aftertaste of misogyny in their curation choices, such as causing Instagram to ban photos of people breastfeeding).
https://www.youtube.com/watch?v=vsazo-Gs7ms