Games

The lawsuit doesn't imply that Steam forces their piece to always be cheaper than the competition. Sales can happen on different stores at different times, thus a game can be $50 on Steam and $40 on Epic today.

But Steam forces sellers to offer "the same offer to Steam customers within a reasonable amount of time" - source (sorry, Shitter link) from this article, which is about a similar lawsuit from 2021.

And the language used means that, while this only applies to devs who make use of Steam keys, it doesn't apply to the Steam keys themselves - if you want to use Steam keys, you also can't offer discounts on competing storefronts. From the source:

Rosen said he ran into that issue when he decided to release Overgrowth at a lower price on other storefronts in order to take advantage of their lower commission rates. "When I asked Valve about this plan, they replied that they would remove Overgrowth from Steam if I allowed it to be sold at a lower price anywhere, even from my own website without Steam keys and without Steam’s DRM," Rosen wrote.