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.
With a big platform, I would be surprised if there were none. Most of them were dismissed or Valve won. I haven’t seen a big one that Valve lost.