Why does Zerodha require its clients to sign 'voluntary' documents on account opening forms?

These documents are labelled Voluntary because they fall outside of what depositories and exchanges have specified as mandatory in the operating instructions (WEB).

These voluntary documents, however, are required for Zerodha's internal operations to provide seamless online services. Therefore, despite being classified as Voluntary in relation to the guidelines, Zerodha has made it a requirement for these documents to be signed.