I think you are confusing data types by treating them as absolute data. Your data on Nostr is not private, at the same time, it is yours in the sense that no one can force you not to share it, except in specific situations. The types of data you are referring to do not apply to Nostr, nor should they be shared. They are data that must be protected. Now, if your thoughts, beliefs, and opinions are important to the point that you do not want them to be mined, cataloged, and used, then neither Nostr, nor any social network, or email platform, centralized web messenger applications, etc. are really for you, because they are using this data or intend to use it regardless of your will and/or knowledge.