@Sh4d0w_H34rt I read the Terms of Use and Privacy Policy because I want to understand the concern, but I don't see why it's anything to worry about for us.

The relevant federation related parts seem pretty innocuous. Threads will send user data to third party services which will then collect and display it to their users (us) and third party services will send their data (our posts) to Threads who will then collect and display it to their users. They can't guarantee third party services will delete Threads users' data even if requested, but Threads will make "reasonable efforts" to delete any third party data on their servers for which a delete request comes through over ActivityPub.