They built a kanban board and a collaborative notes application. There is nothing wrong about that.
Quite the contrary: Project and knowledge management or so important that you should not have just one (and additionally closed-source) application for that.
It's good to have competitors who focus on different workflows (Evernote was not built to be collaborative, Trello does not offer other display modes such as cards and a basic calendar).
I would not complain if they created another CRM as simple as Highrise or an open source helpdesk that could replace Zendesk (I really like helpful.io for this, btw).
They are like the Rocket-Internet.com of Rocket-Internet.com...It's getting almost too meta for me to handle.
More seriously, what's the problem here? Maybe they actually take security seriously (compared to Evernote), and maybe syncing on Polynote isn't fundamentally broken! (a boy can dream)
http://digicoop.io/products