The web and mobile apps of major conversational AI engines transmit prompts, titles and conversation permalinks to advertising data firms, alongside device IDs, hashed email and other persistent identifiers.
Comprehensive analysis, like always from this team:
https://jorgegarciaherrero.com/wp-content/interactivos/20260916-Prompt-like-a-butterfly-sting-like-a-tracker-(clean).pdf
Plus, OpenAI's new integration with LiveRamp (acquired by Publicis) enables profiling and targeting using population-scale identity records linking names, postal, email, phone, and digital IDs associated with devices, browsers and platform user accounts:
https://liveramp.com/blog/bringing-the-power-of-rampid-globally-to-custom-audiences-in-chatgpt-ads