There are a number of businesses we could build around the project. A cloud service or enterprise products/support are the obvious ones. Right now, we're focused on community building, because a potential open source business can't be successful with a healthy open source project.
So you got funding from YCombinator without a concrete plan to make a business? That's pretty interesting, I always thought they wanted profitable businesses, and turned down ideas they didn't think would work.
Great to hear they're betting on open-source more!
Even still, I think most people apply to YC without a concrete plan of how to make a business. It's normally so early stage, that the plan is yet to be validated and will probably change. A "plausible" plan is perhaps a better way to put it. ;)