In fairness they're a new company and probably only have a basic view on how they're going to make money. They just licensed their core code under 'free software' so it makes sense for them to have a CLA. It will give them some flexibility as they figure out their commercial path - though I can't actually find the CLA on their site.

Anyway, in comparison good luck finding a 'free software' license for the Gmail API, or a CLA - and that's from a company that's benefited from Open Source more than any other.