Professor Chris Marsden discusses the need for a regulatory framework to govern big data platforms in the public interest, highlighting the historical context of technology regulation and its parallels to past transportation and communication regulations. He argues for a comprehensive 'prosumer' law to protect users' rights, ensure competition, and address data privacy issues amidst current unregulated conditions and challenges posed by major tech companies. The document also critiques existing regulatory measures and emphasizes the importance of user control over their data.