For obvious reasons; we don’t ship to alternate stores - even if such a thing as iOS sideloading existed; we wouldn’t support it, and we of course do not support anything but the Play Store on Android.
It’s obviously partly a support cost issue - there would be less than 1% of our millions of users using F-Droid, etc - and, more importantly; it’s a security and support issue.
I think for a while we even had some sort of check that would detect a jailbroken iPhone or rooted Android device and attempted to refuse to run on them. Security is so far above the #1 priority working in banking it’s insane. We’d never consider anything outside of Apple or Google’s official solutions. We actually have real life contacts at Apple to help address specific security or approval concerns; which is practically unheard of.