It will probably still get kicked off by Apple.

Google can, (and does) arbitrarily delete apps, including sideloaded ones, from any Android device via Play Services. The last time Google used this feature it deleted KDE Connect, a popular open source app, from users’ devices, without their consent.

https://discuss.kde.org/t/f-droid-version-of-kdeconnect-uninstalled-by-playprotect/5992

I would be very surprised if Apple did not have something similar ready when iOS “sideloading” is made generally available.

The last time I checked the progress on this, any individual/company who wants to sideload their app on iOS needs to pay 10k to open their own appstore on the platform (with distribution still managed by Apple), then release the app via that store - not remotely comparable to Android sideloading

Edit: Wrong community sorry - deleting response