The cloud deployment model that features joint ownership of assets among an affinity group is known as:

The community cloud deployment model is designed for a specific community of users who share common interests, concerns, or requirements regarding security, compliance, or other operational aspects. This model allows multiple organizations to jointly own and manage the cloud infrastructure and services, creating a collaborative environment that caters to their shared needs.

In a community cloud, the participating organizations typically share access to the underlying resources, policies, and applications, resulting in a more tailored solution compared to other deployment models. This model is advantageous for organizations that want to benefit from economies of scale typically associated with cloud computing while maintaining a level of privacy and control over their data and applications specific to the community's needs.

Private clouds, while also emphasizing security and exclusivity, are owned and operated by a single organization rather than a group, thus not allowing for joint ownership. Public clouds are accessible to the general public and do not facilitate asset sharing among a specific group. Hybrid clouds combine elements of both public and private clouds, but again do not define the joint ownership characteristic inherent to the community cloud model.