Valve revised its Steam Distribution Agreement and Revenue Share Tiers to give more profits to “big game” developers.
Steam now takes 25% cut once a game’s revenue hits $10 million, and 20% after $50 million, from which 30% cut of all games. This “Revenue” also includes DLC, in-game purchases, and community marketplace fees, not only the base game.
At the interview with IGN, in QuakeCon, 2018Bethesda’s Senior VP of Marketing & Communication Pete Hines discussed why they’re not releasing Fallout 76 on Steam and future Bethesda’s title release on Steam.
“We did not announce all future Bethesda games will not be on Steam. That is not what we said. We said this game (Fallout 76) will be available exclusively on Bethesda.net.”
“We haven’t decided on anything else […] it’s an online, ongoing game. We feel like the best way for us to provide the best experience and service to our customers is to be dealing with them directly, and not through someone else.”
In short, Fallout 76 is not releasing on Steam because they want to service directly, for better player experience. And future title release is not yet decided.