My guess was that Apple is okay with Apps from third parties that tithe 1/3 of their subscription revenue but aren't willing to make a place for them if they don't "sing for their supper" as my Grandfather used to say.
I haven't been an Apple user for over 10 years, through that macOS now uses the App Store to distribute OS updates. There is no getting around the App Store on macOS and must be used for Apple related software releases, such a Xcode.
The community that looks for applications not in the App Store is most likely quite low. It requires knowledge of the ability to side-load, how to do it, and where to find applications that can be side loaded. Homebrew installation ratio against total macOS users might be a good metric.
I have five apps that get regular updates via DMGs, two of which are unsigned and do not meet Apple’s sandbox requirements.
All I have to do is authorize them to install in settings.
You and I can agree on Apple’s App Store power and abuses, but you can still call MacOS a computer OS.
Apple’s main source of innovation is applying mafia tactics to software distribution.
Main source of innovation? What about the Mac, iMac, iPod, iPhone, iPad, Apple watch, AirPods and M1 MacBook Air, all of which transformed their product categories? Not just because of the hardware, but also because of the hardware-software integration.
Even Apple's failed innovations (Apple Vision, etc.) are interesting products that push the envelope.
Also I think you’re overreacting with some of your examples there. You seem to be conflating “successful” with “innovative”. The two terms aren’t mutually inclusive.
If the app store is “mafia tactics”, I can’t even imagine how demonic things like wholesalers mist be.
If you had put up your website back in the early 90's and were judicious about advertising back then, you might've been a Fortune 500 company (depending on your business niche, of course)!
Wether or not the 30% is proportional to the value you get by being on the App Store depends on your situation. That is why choice is a great thing.