The Prof G Pod with Scott Galloway Meredith Whittaker on Who Controls Your Data in the Age of AI
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Mar 5, 2026 
Meredith Whittaker, president of the Signal Foundation and AI policy expert, explains Signal’s privacy-first design and why most messaging apps collect far more data. She warns that OS-level AI agents and cloud LLMs can expose metadata and retained queries. She critiques AI as a marketing term, discusses surveillance-driven business models, and urges stronger consent and data authority.
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Signal Built To Collect Almost No Data
- Signal minimizes data collection and rewrites core parts of the stack to provide private messaging without monetizing user data.
- Meredith Whittaker emphasizes open source so anyone can verify Signal’s implementation rather than trusting corporate claims.
Encryption Claims Hide Metadata Differences
- Encryption claims vary: WhatsApp uses Signal’s protocol for message contents but often exposes revealing metadata.
- Meredith contrasts content encryption with metadata protection, noting Signal encrypts profile photos, contacts, groups and more.
Agents In The OS Can Defeat App Privacy
- Agentic OS-level AI threatens app-layer guarantees by needing deep access to calendars, files, browsers and messaging.
- Meredith warns such agents often send data to cloud LLMs, creating new vectors bypassing app encryption.