This means that they are providing their audience with no option but to have a social media account (where their interests can be tracked and cross-referenced, data mined etc), not to mention that they endorse and promote particular for-profit private companies (which is in general not done lightly, unless there is a partnership or other disclosed interest)
New open source tools like this engine, especially if they integrate more with this other wonderful piece of tech, the email client could create a more healthy information retrieval environment. The time to think anew about how to evolve a positive digital life is now and the pieces of the puzzle are all around us.