I think developers are just unhappy they pay a cut to Apple at all… Developers could always just increase their prices. Maybe that’s what needs to happen. Consumers need to get used to the idea that app are more intense to make and cost more, or developers need to accept the competition.
A big part of the problem is that, early on, the app store had prices, on the whole, that were more reflective of what it took to write and maintain the software (eh, closer anyway). But then we got a race to the bottom - developers tried to drum up sales by pricing their apps cheaper than the others, and they all (well, all the ones playing that game) went lower and lower until we arrived at "free, with ads", and "free, with microtransactions". And this "taught" consumers, incorrectly, that software had very little value.
I'd be happier to go back to paying quite a bit more for apps, up front, so that they have a solid funding model. For some apps that I use a lot, I'm fine with reasonable subscriptions, if that's their solid funding model (frankly, I'd be happier with "$X for the app + $Y/year for maintenance / upgrades / support", for those apps I depend on).
I think Apple ought to lower their 30% cut to, oh, somewhere in the 20% or even 15% range, but that's just an opinion, not something that the government should enforce, and not something that developers or consumers are
entitled to. Apple put a tremendous amount of work, and money, into developing, maintaining, and supporting the iPhone and iOS and the App Store, and it's pretty clear to anyone who bothers to look, what the situation is, before buying (you pay a lot up-front for the hardware, to get really nice hardware, nice support, hardware that will work and be supported for a long time, good security, strong attention to customer privacy, and a pretty safe walled garden to play in) -
if that isn't what you (they) want, don't buy an iPhone. And by all means, do NOT: fail to inform yourself, and buy an iPhone, and then demand that particular features of the ecosystem you bought into (walled garden, etc), must change because you wanted something different - if you want something different, go buy that different thing instead.
I have very little sympathy for people who buy a device that costs many hundreds of dollars without doing any research on how it works and what its limitations are. If they do that, and are unhappy with the result, that's on them. (I'd have the same lack of sympathy for someone who bought an electric car and then got enraged that they couldn't fill it up at a gas station.)
(Now I'm ranting too.)