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Time's Up needs Screen Time access to hold a lock. Open iOS Settings ▸ Screen Time and make sure access is granted, then open Time's Up once so it can re-arm.
Subscriptions are managed by Apple: Settings ▸ your name ▸ Subscriptions. The lifetime purchase is one-off and never renews.
Tap Restore purchases on the plan screen while signed in with the Apple ID you bought with.
Yes — with a wait that gets longer each time you use it that day. Strict mode removes the option entirely for that block.
Nothing leaves your phone. See the privacy policy.