The GameDiscoverCo newsletter highlights the success of the unreleased survival-climber game "Cairn," which garnered over 500,000 demo downloads on Steam and PlayStation 5. This achievement is attributed to its excellent gameplay, methodical marketing strategy including participation in numerous Steam festivals, and effective use of Steam's demo visibility features. The newsletter also covers June's top-streamed games, with Grand Theft Auto V leading viewership, and notes the platform debut of Roblox and new entries like Mario Kart World. Other news includes Steam's new performance monitor and potential shifts in consumer spending on leisure activities.