Has it really been that long? Apparently so. Valve originally announced their rebranding of Steam Play with Proton back on August 21st, 2018. Seems like a good time for a quick reflection being halfway to a decade old now with the tech that gave rise to the Steam Deck.
[citation needed]
I’m not aware of Valve or Doitsujin ever revealing how much they paid him to make DXVK. I assume they paid him reasonably well, but I doubt it was an ass-load.
Or maybe that Wine was a lot more work than the direct3d-to-vulkan shim that was done mainly by one person (now two people).
Valve definitely helped by funding a few key projects, and packaging them in Steam made them convenient to use, but I think exaggerating their role unfairly diminishes the much larger body of work (done by other people) that makes it possible at all.
Proton stands on the shoulders of giants.