My assumption is that a non-technical person would go with some key-in-hand automatically configured solution. So to be on the safe side, any ready-to-use blog hoster should, by default, set all links to be nofollow links, right? Because you really _have_ to know about nofollow if you want to use it only some of the time.
Also, a non-technical person, upon being told that they can't link to their own site and probably also to the sites of other authors on the blog, might not be inclined to see this as anything but some arbitrary rule.
All is probably lost, anyway. This just speeds up the exodus of non-technical bloggers into the walled gardens that lure them.