This varies by publisher and it is totally at each publisher's discretion on whether they employ do-follow or no-follow links. In general, we have observed that publishers usually employ no-follow, as popular publishing platforms such as Wordpress set external links as no-follow by default.

With Linkby, our link is objective and employs 301 redirection, so that all that SEO "juice" flows seamlessly if the publisher allows do-follow links on their site.