@ColinOatley Thanks for asking. Here are a few links relating to your question:

https://arstechnica.com/security/2023/07/how-threads-privacy-policy-compares-to-twitters-and-its-rivals/
https://mashable.com/article/threads-tracking-data
https://www.outkick.com/mark-zuckerberg-has-access-to-your-credit-score-via-threads/
https://techaeris.com/2023/07/07/metas-threads-by-instagram-collects-a-lot-of-data/
https://www.foxnews.com/media/mark-zuckerberg-twitter-killer-threads-enrages-users-data-collection-privacy
https://arstechnica.com/tech-policy/2023/07/threads-attracts-30m-users-in-24-hours-despite-design-flaws-privacy-concerns/
https://www.theguardian.com/technology/2023/jul/11/threads-app-privacy-user-data-meta-policy