Hey Nick!
As a result of the acquisition, we (IGDB) have released our entire API under a single free tier (we essentially turned our old Pro tier into the free tier). When it comes to commercial use, you should be fine using our API as such currently. We will be releasing a community update regarding commercial specifics in the coming months as we are finalizing some policy details.
In the meantime if you want any direct help i’d suggest jumping into our Discord server. Our devs hangout there and we have a very active community of fellow API users who can help too. And sorry about the delay in answering, happy new years 