App removal
The way out of a frozen rule has always been to delete Cactus. There’s now a switch for that under preferences, called App Removal.
It’s not on by default and the app never asks you to turn it on. If you do, no app on the phone can be deleted, Cactus included. It’s iOS’s own setting, so it holds with Cactus closed. Turning it back off asks you to repeat a long quote.