It sounds like a pretty sweet deal, but I kept looking up and down the page trying to find the catch. Is it purely a promotional thing for the companies to which you get credit? If so, I think it could use some emphasis that you are getting this in exchange for nothing at all. I know it says "free", but that doesn't necessarily mean they don't expect something non-monetary in return.
Think of it as an extension of the freemium model. The premise is to get startups hooked on valuable services that they will subsequently pay for as they grow.
It's no different to all the "free" services associated with the major accelerator programs.
Like a dealer handing out samples of crack to grade-schoolers.