No. On first install the App starts a local 7-day Pro preview. It requires no payment method and never charges you. When it ends the App returns to the free tier and your data is untouched.
Tasks and steps, Today focus at the default 25-minute duration, up to two custom lists, local completion notifications, Lock Screen Live Activities, the Today widget, and seven days of focus statistics and history.
Unlimited custom lists, recurring tasks, custom focus duration, iCloud sync, the interactive Focus widget, and monthly/yearly statistics with a longer focus history.
Open Settings → Restore Purchases, signed in with the same Apple Account used for the original purchase. Both subscriptions and the lifetime purchase can be restored.
Subscriptions are managed by Apple. Cancel in system Settings → Apple Account → Subscriptions. Pro remains active until the end of the current billing period.
Check that the device is signed in to iCloud, that Settings → iCloud Sync is enabled, and then force quit and relaunch the App. The first sync needs a network connection and can take a while.
Two switches are required: Settings → Lock Screen Live Activity in the App, and Settings → Done & Next → Live Activities in system settings. Then start a focus session from Today.
No. By default everything stays on your device. Only if you enable iCloud sync does data go to your own iCloud private database, which we cannot access.