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>Then Proton came and, almost overnight

I haven't been able to find any info to confirm but I have a sneaking suspicion that Proton builds heavily on Codeweaver's Crossover. The vast majority of commits in the Proton repo come from Codeweavers employees

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https://www.forbes.com/sites/jasonevangelho/2019/09/19/fine-... Valve has contracted Codeweavers

I think the biggest change was bundling (and funding the development of) DXVK which the Wine developers were too stubborn to adobt over their own wrapper.

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