@Plykiya
Not sure that counts. Groups who opt out do so because they want more traffic on their site. Then, having the link in the reader would only be beneficial to them. Although you may not want to help them. The only bad thing here is it incentivizes groups to opt out. I doubt, however, many groups would opt out solely because of this feature. That's because they could do it manually, by restricting upload access to group members and posting, say only the first chapter's page with a link to their site.
Lurking through MU takes up too much time. Not great for user experience.