A controller must not discriminate against a consumer for exercising rights, such as by denying goods or services, charging different prices or giving a different quality; it need not provide a product requiring data it does not collect and may offer different terms in connection with voluntary participation in a bona fide loyalty, rewards, premium features, discount or club card programme.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.