Gmail, Skype, Google Docs, Trello, Telegram - all these products are free, easy to use and overall they seem very convenient.
Now I stop and think why? Why would someone give you access to their infrastructure for free? Why would they constantly pay software engineers to keep their products updated? Why they constantly implement top class features and improvements? What are they getting back that is so valuable to compensate for all their costs? The answer is very short and very simple: POWER.
But I have the right to say NO, I have to right to not be a part of their system. That's why the mission of Mainframe is important to me.
In terms of value, I believe that most of the decentralized projects are going to need sooner or later a secure communication protocol, so there is a high chance that Mainframe will have a good adoption rate.