Found this on the GoDaddy website. Seems to exclude the majors .com, .net, .biz, .info, .org.
Maybe some history on these with godaddy customers?
Domain Ownership protection is not available with the following extensions.
QUOTE: What is Domain Ownership Protection?
Last Updated: June 1, 2006 Domain Ownership Protection is a premium service that you can apply to any of the domain names you purchase or already have registered with us. It helps ensure that you retain ownership of your domain name, regardless of expiration dates or attempts to transfer.