Turns out in addition to plain vanilla surveillance, ad tech companies have figured out how to build zero-click spyware and and de-anonymize and fingerprint and target individuals.
https://citizenlab.ca/research/how-discover-tech-turned-targeted-ads-into-a-pipeline-for-spyware/
Commentary
https://pluralistic.net/2026/10/17/mercenary-spyware/#discover-tech