Welcome to the forums and thanks for your feedback.
You're right, you don't have to be a forum member in order to read posts. All our pages are indexed by Google, and in fact many of our members actually find our forums by searching for a particular topic this way. "Closed" forums that display posts to members only are generally a lot less busy, and we want this space to be accessible as possible.
With regards to privacy, we encourage our members not to share any personal information here that could identify them, and if they do our moderators will edit it out (for example, using a full name as your display name, saying where you live etc, links to your Facebook page or email etc). If you do happen to see any posts where someone is disclosing information that could breach their privacy, please use the 'report post' function to let us know about it.
You can find more information about how we ensure this is a safe space by watching our welcome video below: