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Add the MindfulPause shortcut once. Then create one short automation per app: Shortcuts → Automation → “+” → choose App → pick the app, “Is Opened” + “Run Immediately” → select the MindfulPause shortcut. The detailed, illustrated guide is right inside the app under Settings → Help.
Then “Run Immediately” is not enabled in the automation. Open the automation in the Shortcuts app and choose “Run Immediately” (instead of “Run After Confirmation”). This is by far the most common stumbling block.
For every additional app you simply create its own automation (same steps) and pick the same MindfulPause shortcut.
No. MindfulPause collects no data, everything stays on your device. Details in the privacy policy.