Valve's Steam grew from a patch tool into the PC games platform

Steam launched on September 12, 2003 as Valve's digital delivery and update system, first for its own games. Twenty years later it remained the dominant PC distribution platform, as The Verge noted at its anniversary.

A 2023 Policy Press study of the games platform economy describes Steam as a multi-sided market: the platform owner attracts game publishers and gamer communities and controls the market interactions between them — a distinct platform business model rooted in the economic features of games.

By adding storefront, community, workshop and marketplace features, Valve turned a technical necessity into the infrastructure other publishers depended on. The companion chapter analyzes how market interactions on Steam are shaped, making the platform a case study in controlled ecosystem design.

Turn your infrastructure into the market

Built-in updates solved a real problem before anything else.

Opening to third parties multiplied the catalogue.

Community and workshop features raised switching costs.

Controlling the storefront gave Valve a take on the whole market.

Solve your own painful problem with infrastructure, then open that infrastructure to rivals: the platform captures value from the whole market, not just your product.

Steam became the template for digital game distribution, and its platform configuration — owner-controlled market interactions between publishers and gamers — became the reference model analyzed across the platform economy.