Select default cover-art on a case-by-case basis rather than taking a US-centric viewpoint
It is my understanding that you are planning to implement a system where multiple cover-arts can be uploaded. This is a good start, but I strongly suggest you consider allowing the defaults (those shown on the IGDB page to logged out users, and those shown on Twitch) to be selected on a case-by-case basis. Factors such as popularity in differing regions and how the game is represented need to be taken into account, for example there are games that, though they released in the US, never received any sizable following there whereas they did elsewhere. To only allow US box art as the default presents a toxic US-centric viewpoint of games even if said games were not popular in the US at all, essentially rewriting history and discarding the existence of other regions.
Cover preferences has been mentioned in the pipeline, but for right now the default for NA covers is a Twitch mandate, not a choice by IGDB who themselves are based in Europe. Additionally, it's alot harder to quantify "popularity" over an entire database globally for all users in the meantime, hence the Twitch mandate.