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.
Or Pheonix Point, where Epic bought an kickstarter game that was funded under the promise of releasing on Steam, GOG and potentially other stores and promptly made it exclusive - and this was in the early days when their launcher/store was in a much worse state too.