There is no service being offered, so these terms mostly say so.
This application is private tooling operated by one person for their own Google account. It is not made available to any other user, and no access is granted to anyone by these terms.
The software is provided as is, without warranty of any kind, express or implied. The owner accepts no liability arising from its use.
The application is operated in accordance with the Google API Services User Data Policy, including its Limited Use requirements. It accesses only the owner's own data and only for the owner's own purposes.
These terms may change if the application does. The current version is whatever is published at this address.
Via an issue on the source repository.