But nit: that's not what "exception that proves the rule" means. An example of that saying is a sign that says "no parking 2-4pm", which proves that there is a rule that you can park any other time. WoW, Fortnite, CoD, Minecraft, those are just "exceptions".
What stands out to me is that while most studios accept that they've got to pay their tithe to valve in order to succeed on PC, for many it seems to begrudgingly so and where they have the capability they investigate using their own or alternative channels to get a better rate. It's an interesting parallel to Valve's moan around 15 years or so that Microsoft could E.E.E. PC gaming and the linux direction was hedging against that.
CDPR also puts all of their games DRM free from release on GoG - including The Witcher 3 and Cyberpunk 2077.