Some specific benefits competitive apps stores could provide (within the general benefits of
competition and
innovation):
1. The open source app store. The git hub app store. Open source apps easily prepped by developers and installed and updated by regular users. With source and build files.
2. The developer tools app store. Real developer tools on iOS devices.
3. Lower app store vigs. Lower app prices. Allow the lowest cost part of the market to drop prices further. I would love to buy tiny solid 0.25 cent apps without ads. Maker markets without a parasitical Apple tax.
4. The ad free app store. Sorry I even imagined it, it just hurts to think about it.
5. And the no "in-app purchase" store. Only for substantial apps worth paying for up front. Use forever, or choose to pay again for an upgrade you actually want.
6. Children's only app store, with high safety bars of all kinds. Very parent friendly.
7. Formally verified app store. Starts small, but learns. Meantime, more safety than Apple can deliver by one astronomical unit. Pushing Apple to improve its safety MORE.
8. Different kinds of app infrastructure. Streaming apps and games from anyone. Better systems for software versioning, updating, cross-app plug-in mechanisms.
9. One shop app-stores that deliver different kinds of versioning, upgrading, and other kinds of support that Apple doesn't in a coherent manner.
10. The very safe no-code app store. Sorry, app stores with different approaches! Very sandboxed, but very easy for technically literate non-coders to create simple tools for anyone to use. Given the solid sandboxing, and restricted "source", no barriers for anyone to contribute their app. Maker friendly.
11. The novelty developers 1k-byte app store. It's just for fun but how cool would that be. Innovation in efficiency as a game. Other developer app store experiments. Innovation comes from freedom. (Had to turn this list up to 11.)
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None of these inconvenience those who wish to stay on Apple's store.
They will only push Apple to increase its selling-point safety futher, while, while dropping anti-innovative self-interested restrictions it has misleadingly defended, like its prohibition on other web engines ("But the safety!").
Any other ideas for app stores that deliver useful differences?