People have the right to port their data between service providers so that they have genuine choice of providers. This is distinct from “enable people to access data held about them in an agreed format” as the particular data about a consumer isn’t readily accessible to them, but a transfer between services can be made.
European Union: Article 20 of the General Data Protection Regulation gives people the right to obtain and reuse their data across different services.
United Kingdom: QR codes on utility bills contain energy usage data for quick comparison between providers.
United Kingdom: Current account switch guarantee automates the process of changing banks by automatically transferring balances and direct debit instructions.
Switching mobile phone number: Communication regulators in many countries mandate that mobile phone numbers can be transferred between different networks.
Large, interlinked services operating effectively as monopolies could block transfer of data to services with a narrower focus.
Companies could use anti-patterns that make it difficult for people to transfer data between services.