If you do not want to allow that action then you would have to edit the actual uploadphoto url and remove from the end of the url this
Code:
Content visible to verified customers only.
Now obviously depending on your integration things may be a little different on how you do it but in vb4 the upload url is in the navigation manager of
vb admin panel. In a non vb4 install you would have to edit the url in the function topmenu in pp-inc.php