Just one note - Valve don’t care whether or not Steam keys are provided - if you sell on Steam then you can’t sell anywhere else cheaper.
That’s the claim made, but Valve has stressed this isn’t the case and the policy text doesn’t support that claim either. It very explicitly mentions Steam keys.
EA often does this actually for the games they offer through the EA app. EA has their own infra so you don’t get a Steam key if you purchase it from there. As a result EA games are occasionally slightly cheaper there or go on sale a bit more often than they do on Steam, so they can lure customers to their own storefront.
That’s the claim made, but Valve has stressed this isn’t the case and the policy text doesn’t support that claim either. It very explicitly mentions Steam keys.
EA often does this actually for the games they offer through the EA app. EA has their own infra so you don’t get a Steam key if you purchase it from there. As a result EA games are occasionally slightly cheaper there or go on sale a bit more often than they do on Steam, so they can lure customers to their own storefront.