

I don’t think the example at the end of your comment is relevant, since to my knowledge it’s the publisher deciding on pricing and doing sales, and steam is still taking the same cut.
I also think it’s generally not a great thing, since it basically puts the value of the game at $5, making it not worth getting off-sale, while also creating urgency to do so during a sale. I respect Factorio developers’ choice to just not do sales at all, and state so, so that buyers know exactly what the price is.









Valve gives you free steam keys for your game on request, which you can sell off steam, without paying Valve a cut. This has a specific rule that disallows selling those keys for a lower price. However, not sure if it’s this case, there was an email from a Valve employee submitted as evidence telling a game developer that selling their game for less in general would be undercutting steam, and something they wouldn’t want. If the email is real and not a misinterpretation, Valve indeed was/is pressuring developers to not sell games cheaper elsewhere.
Also, sales and giveaways are exempt from the steam key price parity rule, which I would assume epic’s free games would fall under, if you applied the rule to that despite not involving steam keys.