The profiles of your ancestors all have the Open privacy setting. If you click on the lock in the upper right corner you will get the details. This is the policy for open profiles:
Anyone can view the information on an Open profile, and any WikiTree member in good standing with a confirmed e-mail address who has signed the Wiki Genealogist Honor Code can edit it. All edits are tracked, credited to the appropriate member, and can be reversed.
WikiTree Leaders can merge 200-year-old Open profiles. The mission of the WikiTree community is to connect modern families with ancestors on a single family tree. Merging duplicates is an important part of this.