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.
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The 10 developers Valve hired have nearly nothing in their Github profile. Proton history is nothing but community based code and a copycat of Wine, just like everyone said in the very start of Proton.