In my case I've had to sideload Netflix because it won't run on a device with an unlocked bootloader (annoying).
This would actually make me far more interested in running iOS.
Facebook is running into the same issue trying to launch their Facebook Gaming app on iOS. Apple keeps rejecting them because it's an app store, according to their policies.
https://www.nytimes.com/2020/06/18/technology/apple-ios-face...
Until recently you couldn't purchase books in the Kindle app. I'd have happily downloaded a non-broken version from Amazon.
There are many examples of apps with strong safeguards that aren't allowed in the apple app store.
Amazon already tried this exact thing on Android, where the barriers are a lot lower. They've never had success with their app store outside of their first-party devices. Why? Because it's too dang hard, and I'm willing to pay an extra buck for Minecraft if I don't have to track it down in another app and worry about malware coming through the wall.
I'm all for a switch to install unsigned software, but only for development stuff. The App Store serves as a good barrier for 99% of users who just need to turn on their phone and use the darn app. The other 1% just need Apple to put a hidden switch to disable the protections ala csrutil in macOS and we'll be fine.
In our case, the demand being consumers, they are friction-averse and if you don't have a rock solid and unique value proposition, they tend to stay wherever they are.