123 Time registration use and transfer to any other app of information received from Google APIs will adhere to Google API Services User Data Policy, including the Limited Use requirements.
See the Google Authorization window at the right, or in more simple and precise words:
The add-on enables you to create and format a spreadsheet that will store the Calendar events from the Calendar you select for the time frame that your specify. The Google Calendar ™ events of the selected (secundar) calendar are exported to this created spreadsheet. The add-on write the events towards the Google Spreadsheet that is created within this add-on. No spreadsheets are deleted, no other spreadsheets are accessed.
Reason; The add-on is always shown in the Google Workspace Calendar sidebar. The add-on is only visible in the Google Calendar sidebar.
The add-on reads from the selected (secondary) calendar all events in the specified time range. The add-on only access the secundar calendars (not primary calendar). No events are created in the calendar. In case you enable the sync option the calendar title and/or description will be updated in the Calendar event based on data from your Spreadsheet.
The script needs to know your local timezone to understand the relevant time.