Didn't the Epic lawsuits against Apple and Google end up showing Valves Steam cut ended up working out to something closer to 20% after all the key sales and whatever other factors. Plus EGS already does less than 20% cut and it's been like 6+ years and that client is still bare bones and they don't even do gift cards or price lower. Same for Microsofts store which I believe is lower on PC while still 30% on console.

Regardless at best this lawsuit would just mean an end to 3rd party steam key sales or Valve taking a 30% cut on those too. At best a victory against Valve would mean more expensive games with the loss of keysite stores pricing advantage

Also games used to MSRP $10 cheaper on Steam when there was an argument that going digital was a major cost savings compared to physical products/packaging, shipping, and retailler cut. Eventually publishers stopped caring and made physical and digital prices the same while adding an assortment of DLC and subscriptions