Because PaaS runs consumer tasks in provider-controlled middleware and a shared host operating system (typically container-isolated), access control is applied to operating system memory, including processes' use of processor caches; a method of flushing processor caches at context switches protects memory data, limited to highly sensitive data so that performance is not degraded.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.