"Steam is a benign dictator, so what's the problem?" There were lots of people happy under the Nazi regime too.
Ah yes, the typical "try to put the other person on the side of Nazis" debate tactic, always the sign of an argument with a strong foundation.
And yet all the other competitors combined comprise a mere 25% of industry revenue.
Marketshare is not proof of antitrust. Again, the PC platform is entirely open, the barrier of entry is low, there are many competitors, consumers have abundant choice and I don't see any demonstrated harm by one company simply having a market share percentage that offends you.