http://6wvybf7ub3xk5ow66wt7os3aovbzoo2eei6vjirvhvvkmqg4alnezzid.onion/sites/preventit/public/3-faq
The risk of identification based on stored data, even for someone with access to the data in a decrypted form, is under the participant’s control - by avoiding typing in identifying data (for example in conversations and chats), or by avoiding using an email address that can be linked to an individual, there is very little information stored that could make linking possible.