What are you even talking about? I have installed dozens and dozens of apps on my Macs over the years, and never a single one from the Apple App Store. I don't understand what developer in their right mind would put it on there just to donate a nice fat percentage straight to Apple, as if Apple are some sort of charity of something.
And don't give me this tripe about paying for developer tools. I'm a developer, and the last tool on earth I'd ever want to use is one made by Apple. Sure, they build the OS, blah blah. But as a Mac user, who just paid a ridiculous fortune for my new 16" MBP, complete with the insane Apple Tax on my RAM/SSD upgrades, I think its the hardware buyers who are well and truly covering the costs of developer tools thank you very much.
And of course, this is exactly the original model of how computers were, and still are, sold. The computer company builds the hardware to sell to people. But they can't sell it if there's no software for the users to run on it. So the company also builds the OS and developer tools to make it easy for software companies to compile their software to run on the computer company's hardware.
This idea of taxing developers 15/30% of their revenue (yes, revenue, not profits, thus creating a situation where the developer can end up making a loss, while Apple makes a nice little earner from the developer who is going broke), is a new one that is only possible with a complete monopoly control of access to a dominant platform. It's corporate greed gone to new evil levels, and for some bizarre reason, is cheered on by the zealots on this site as they bow to their Apple God.