Recommendation System

I've got egg on my face because Steam's Personal Calendar feature has apparently been a test this whole time and is only now actually a fully fledged component

Valve has announced that Steam's Personal Calendar feature, which suggests recently released and upcoming games based on user playtime profiles, has officially launched out of Steam Labs. The feature uses data from players with similar gaming habits to recommend titles users are likely to be interested in. This marks a broader effort by Valve to enhance Steam's discovery tools and algorithmic recommendations.