Epic experts claim that the AppStore process does not add any security to your life, the OS is already secure!
Meanwhile on Android land we learn that key-logging “builds trust with your partner”: spydrill.com/best-keylogger
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I don’t think that iOS would allow for keylogger on non-jailbroken iPhone even with side-loaded app, there’s still sandbox working.
While no one denies that AppStore increases security, it doesn’t mean there will be no signing or sandbox anymore.
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iOS supports third party keyboards so app store review is the only theoretical barrier to it.
iOS doesn't directly support third party accessibility services like Android. They support a lot of the same capabilities but mandate special review. Not required for keylogging though.
No reason a local exploit would be required to install a third party keyboard and grant it the required access.
If you were allowed to install apps from anywhere, then you could install a keyboard doing this.
iOS does already have a limited way to sideload apps for developers.