GOG is a pretty good company with a good store and good management of classic games.
But steam, for a 30% cut of a dev's income, will provide; Free save backups, free multiplayer and friends list management and apis, workshop support for modding, free keys to sell on other platforms or give away, a store that actually managed to reduce it's serious junk clutter problems for many people, VR runtime, HUGE controller apis that bring incredible functionality for remapping and macros, a system for game streaming and remote coop play, easy steam deck distribution now, a complete patch management and distribution system etc.
Basically Valve exposes a lot of features to game devs when you release on their storefront, and a huge amount of those features are just straight huge wins for gamers and consumers.
But steam, for a 30% cut of a dev's income, will provide; Free save backups, free multiplayer and friends list management and apis, workshop support for modding, free keys to sell on other platforms or give away, a store that actually managed to reduce it's serious junk clutter problems for many people, VR runtime, HUGE controller apis that bring incredible functionality for remapping and macros, a system for game streaming and remote coop play, easy steam deck distribution now, a complete patch management and distribution system etc.
Basically Valve exposes a lot of features to game devs when you release on their storefront, and a huge amount of those features are just straight huge wins for gamers and consumers.