Earlier quoted context omitted.
Don't forget this link, the anonymous GitHub employee response to Horvath's claims: "Facts Conveniently Withheld". https://medium.com/p/d96f431f4e8e
I sort of feel that if this anonymous posting was 100% accurate, then the cofounder wouldn't have resigned. Better if the people involved came out and told the truth.
Also, it may have come out in the investigation that the founder gave his non-employee wife way too much inappropriate latitude inside the company. She's conceded that she went too far with her activism around her startup. But especially if she crossed boundaries and had inappropriate access to private company information (as Horvath said she claimed), the founder could take the fall for enabling that.