A lot of work on Wine was done by Codeweavers and as far as I know, Valve subcontracted Proton development to them. Both wine and proton are open source and patches flow both ways with a lot of the same people working on both.
I'm not an expert on the topic, and I might be wrong, but nothing I've ever seen suggests there is any animosity between any of the people working on these projects. This is easily a 'everyone wins' story :).
My only issue with protonis that too many folks are referring to proton without knowing about wine, which has caused some misunderstandings and misapplication of credit.
I'd like to see it mentioned somewhere prominently that proton relies on wine.
I'm not an expert on the topic, and I might be wrong, but nothing I've ever seen suggests there is any animosity between any of the people working on these projects. This is easily a 'everyone wins' story :).