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.
Valve is such a weird company.
They became where nearly every PC game is sold by using some of the greatest games of all time as advertising. The orange box has to be the biggest return on a loss leader ever.