If there's no service specific T&Cs for this, it falls under their general cloud T&Cs: https://cloud.google.com/terms/. s.5:
> 5.1 Intellectual Property Rights. Except as expressly set forth in this Agreement, this Agreement does not grant either party any rights, implied or otherwise, to the other’s content or any of the other’s intellectual property. As between the parties, Customer owns all Intellectual Property Rights in Customer Data and the Application or Project (if applicable), and Google owns all Intellectual Property Rights in the Services and Software.
> 5.2 Use of Customer Data. Google will not access or use Customer Data, except as necessary to provide the Services to Customer.
> 5.1 Intellectual Property Rights. Except as expressly set forth in this Agreement, this Agreement does not grant either party any rights, implied or otherwise, to the other’s content or any of the other’s intellectual property. As between the parties, Customer owns all Intellectual Property Rights in Customer Data and the Application or Project (if applicable), and Google owns all Intellectual Property Rights in the Services and Software.
> 5.2 Use of Customer Data. Google will not access or use Customer Data, except as necessary to provide the Services to Customer.