This feels like a false flag operation to me.
Like Apple paid Beeper to do this entire stunt with a bizarre concern about whether iMessage works on other devices, so that Apple could redirect attention away from their monopolistic practices on the App Store.
The App Store is very much a monopoly that exists solely for the benefit of Apple - iPhone users and developers are both massively negatively impacted by how Apple operates the App Store.
Consider all of today's enormous issues in tech. None of them existed before the App Store. Before the App Store, a lot more people created and used FOSS. Literally everyone massively benefited from this. The browser you're using now exists only because of FOSS - Firefox is FOSS, WebKit is FOSS, and every other browser is a decedent of one or the other of those two.
Microsoft tried the same stunt that Apple was able to pull off with the App Store about a decade prior with Internet Explorer. Had Microsoft succeeded, Microsoft would have full control of the internet and these forums wouldn't exist.
Anyways, since Apple (and Google) took joint control over the entire mobile app ecosystem and stranged the internet, everything now depends on ad revenue. All the amazing FOSS we use is now decades old - nothing new has been created, because the idea of making a tool and just releasing it for free isn't viable anymore. I can't release a free iOS App - Apple will charge me hundreds of dollars per year to host my free app.
Apple didn't just murder FOSS. They also murdered the idea of charging just once for a perpetual license for an app. If I (a developer) charge just once, that only covers my bills for this year - if my app still works without any changes, I need to pay Apple a renewal fee. My existing customers won't be able to download my app to their new devices unless I pay that renewal fee. So the perpetual license becomes a lie - Apple forced themselves in as a middleman and demands money from both the developer and the customer.
But wait, it's worse - on any other commercial platform, my app would just keep working for decades to come. Most organizations that create SDKs commit to supporting them for 5+ years. Apple? No way. They throw stuff out all the time. So I as a developer am forced to keep on making changes to my old software just because Apple refuses to think their APIs through in the beginning and make sure that they actually want to support it for the long haul. Except no, it's worse than that - it's planned obsolesce. By forcing me to update the app, I break the app on older devices, forcing my (and Apple's) customers to update to a newer device.
App Stores must die.