Surprised there wasn't also the typical "want to spend time with family" part to cover the fact that the CEO was fired and a board seat was his consolation prize.
If you want to raise $180M without a business model to become a fabled unicorn, you had better know what you're doing.
Docker just got a lot less interesting with an ex-Concur exec in charge, but it'll probably exit within 2-3 years and make the investors happy.