I found a blog post from the developer of Demoracy 4 that gives a platform split for the game based on the PC store.
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Some things to note:
-The pie chart is based on net revenue, so after each respective store's cut.
-The Epic version came out several weeks after the Steam version so it isn't the best direct comparison, but it still did pretty well.
-The developer spent money advertising the Humble Widget version which only takes a 5% charge compared to other stores which would explain the unusually high percentage.
I find this interesting since this is one of the only cases I can remember where a developer actually gave a platform split. It shows, even in the face of increasing competition, Steam is still the biggest player in the PC direct sales market. It also shows Epic is making some headway and the split would have probably been higher if it had released on the same day as Steam and GOG. On the topic of GOG, it's unfortunately a bit player (although it will vary by game, and Cyberpunk will most likely skew more heavily towards GOG). I wish I could find pie charts for games that launched day and date on Steam, EGS and GOG to see what the split is like, but I'm happy to have this information available.
Love this data, I hope we see more developers release this kind of information.