Ubisoft wanted to have their cake and eat it too, you cant have a game cheaper on your own platform and have the game selling at a higher price on your competitor's.
If they weren't confident in their game selling exclusively on their own platform that's on them. But Valve is under no obligation to keep selling a product undercutted by the devs themselves.
They should've already been delisting their own games of they wanted to compete with steam in the first place.
Valve is going to mop up all these antitrust suits like they have before, this is corporate cartel lawfare because they dont want to even try to compete.
You are not a serious person.