Overgrowth developer felt he "had no choice" in filing antitrust suit against Valve

Last month, Wolfire Games - developers of bunny kung-fu game Overgrowth - filed an antitrust suit against Valve. In the suit, Wolfire Games and two other plaintiffs allege that Valve have employed "anti-competitive practices" to "protect its market dominance."
In a new blog post published May 6th, Wolfire Games co-founder David Rosen writes that he felt he had "no choice" in bringing the suit, after Valve told him "that they would remove Overgrowth from Steam if I allowed it to be sold at a lower price anywhere."