Valve isn't pulling any anticompetitive moves though.
Well, they are allegedly forcing price parity on publishers, so they can't sell cheaper on their own website or some other storefront that takes smaller cuts. That's anticompetitive as shit, and they are being sued over it.
Remember Chamberlain? He made his allies submit to german concessions because that would maintain peace. Fast forward five years and we had 40+ million more dead Europeans and the continent bombed to rubble.