Perhaps that's because Steam doesn't seem to be trying very hard to "lock in" developers to their platform. Devs are free to sell their PC games on Gog or Epic or whatever. Steam is popular because it's a good platform. This freedom for developers or customers mostly does not exist on mobile or on consoles, except for the EUs efforts here.
Even their "console" the Steam Deck can, relatively easily, run games from other stores. I'm not saying a 30% cut should be considered fair but they do seem to take a different approach to digital sales than the other large players.
Perhaps that's because Steam doesn't seem to be trying very hard to "lock in" developers to their platform. Devs are free to sell their PC games on Gog or Epic or whatever. Steam is popular because it's a good platform. This freedom for developers or customers mostly does not exist on mobile or on consoles, except for the EUs efforts here.
Even their "console" the Steam Deck can, relatively easily, run games from other stores. I'm not saying a 30% cut should be considered fair but they do seem to take a different approach to digital sales than the other large players.