From the opinion piece:
Last year, I pointed out how many big publishers came crawlin’ back to Steam after trying their own things: EA, Activision, Microsoft. This year, for the first time ever, two Blizzard games released on Steam: Overwatch and Diablo 4.
Valve’s actions do not have to copy those of Google for it to engage in anti-competitive behavior. Focus on the Steam-specific arguments deemed reasonable enough for the judge to allow the trial to go through, like those on the MFN, high profit margin related to the 30% fee, user reviews manipulation, and so forth.