If a jailbreak app contains the relevant Fugu14 entries in its Info.plist, AltStore will automatically guide the user through the Fugu14 untether process before installing the jailbreak.
Refreshing with provisioning profiles causes apps to become untrusted on iOS 14 or later. As a (hopefully) temporary workaround, we instead now always re-install apps to refresh them on iOS 14+ jailbroken devices, which does still work as expected.