I'm not a company, but I want to make an app that uses GiantBomb's API data. My question is, if I charge for that app, does that count as "commercial usage"?
I was in touch with GB/CBS a few months ago regarding commercial API use for dpadd. The answer in it's simplest form was: "what you're doing is cool but it's not worth it for CBS to pay lawyers to draw up agreements until you are big enough that they can't ignore you".
So... build something awesome, get tons of users and then you can work out an agreement for commercial use. Until then, no projects with ads, subscriptions, fees, amazon affiliate links, etc. If that's not something you're comfortable when then it's probably best to look for another API. Unfortunately, there are none better IMO.