Back in April, Overgrowth developer Wolfire Games filed an antitrust lawsuit against Valve.

Wolfire's suit alleged that "Valve abuses its market power to ensure game publishers have no choice but to sell most of their games through the Steam Store, where they are subject to Valve's 30 percent toll." Valve responded in July by filing for dismissal, arguing that the suit "fails to allege the most basic elements of an antitrust case.".

A large part of the initial filing focused on the Steam Key Price Parity Provision, whereby Steam require that developers and publishers not sell their games for a lower price elsewhere than they're offering on Steam.

"Therefore, it would appear that the market reality, at least as plead, is that Defendant's fee is commensurate with the steam Platform's value to game publishers.".

"If anything, the facts provided by the CAC, at least with respect to output, suggest the opposite - a consistent increase in the number of games available in the market and on the Steam platform