Without prior consent, a person may send direct marketing email or texts where it obtained the recipient's contact details in the course of a sale or negotiations for a sale of a product or service to that recipient, the marketing concerns only its own similar products and services, and the recipient was given a simple means of refusing (free apart from transmission costs) when the details were collected and in every later message.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.