A new Dutch class action has been filed against Valve Corporation, the company behind Steam. The case is brought by the Stichting Consumenten Competition Claims (CCC), which has launched the proceedings under the name GameClaim. The foundation acts on behalf of all Dutch PC gamers who have purchased games through Steam or other PC distribution platforms since 2013, IGN Benelux reports.
If it were only about Steam keys, I think I would agree with Steam. Selling Steam keys elsewhere is still making full use of Steam to fulfill distribution of their game.
It’d probably just lead to Steam not allowing devs to get free keys of their games. You lock into Steam and, if you want a Steam version of the game, you have to buy one.