Re: Stripe. When I worked in Amazon's new venture dept we would ask this question when starting something new: Build, borrow, or buy? Meaning: should we start this in-house, partner, or buy someone who does this well already? Most every time we'd try to build it first. Why? To see if we could, to learn what we didn't know, and to understand the market better. I think we need to let Stripe cook a little. It may not be what you think it is...