Proton acts as Valve’s moat by providing instant access to a vast Windows game library across all Linux-based SteamOS devices, eliminating the need for new ports for every device and accelerating adoption.

Open sourcing Proton is a strategic move to expand adoption, speed up development, and keep Valve’s Steam ecosystem central to revenue, while competitors still must secure content and user ecosystems.

Proton’s mix of wide compatibility, ecosystem lock-in, open development, and seamless cross-device experience forms a powerful, sustainable moat for Valve across current and future hardware.

This approach creates a flywheel: more hardware increases the value of Steam libraries, boosting customer lock-in without restrictive practices and widening Valve’s competitive moat.

Even as an open-source asset, Proton includes Steam’s store, the existing library, and hundreds of millions of user accounts, creating a network effect that rivals cannot replicate by copying the translation layer alone.

The Steam Frame and upcoming VR devices benefit from Proton by accessing the existing catalog wirelessly or standalone, reinforcing Valve’s position in VR and handheld hardware.

Valve’s openness speeds Proton’s improvement through community contributions, making maintenance faster and cheaper than a closed solution, while monetization benefits from the Steam store rather than Proton itself.

The moat stems from any Valve device launching with a ready-made library of tens of thousands of Windows games, delivering an immediate catalog and a stronger launch.