Regarding cloud service provider agreements and contracts, unless otherwise stated, the provider is:

Regarding cloud service provider agreements and contracts, unless otherwise stated, the provider is responsible only to the cloud customer. This means that the provider has a contractual obligation to deliver the agreed-upon services and meet the service level agreements (SLAs) with the cloud customer, who is the direct payer of the services. The provider is not responsible for any other parties, such as the cloud customer’s clients, end users, or regulators, unless explicitly specified in the contract. The cloud customer is responsible for ensuring that the provider’s services meet their own compliance and security requirements, as well as those of their stakeholders12.

References:

Shared responsibility in the cloud - Microsoft Azure

Cloud security shared responsibility model - NCSC