Add Wikidata as a source
Since the deprecation of TheGamesDB API, gnome-games cannot retrieve game metadata anymore. I've suggested to switch to Screenscraper, which has data of much better quality (as I've explained here), but the CC BY-NC-SA licencing of the Screenscraper project apparently forbids us to rely on it.
That's why I would like to suggest to use Wikidata instead. The Video Games Task Force WikiProject seems to provide sufficiently abundant and rigorous data, available under a CC-0 licence, and could be completed with data from Steam or itch.io to cover a broad spectrum of games. The API documentation can be found here: https://www.wikidata.org/w/api.php