Reddit

Collects behavioural and device data for advertising, but no precise location and IPs are deleted after 100 days.

Doesn't sell your data, but ad-tech partners receive cookie IDs, IP addresses, and hashed emails — and all public content is indexed by search engines and AI chatbots.

Notable commitments on data minimisation and no data selling, but retention timelines are vague and the public-platform model limits the protections you might expect.