I’m not terribly concerned over the ethics of the defense contractor, what I took away from the article is that Eelco develops some competing products for nix which are proprietary and leads the nix project. Massive conflict of interest he refused to address. Furthermore, his behaviour in the community isn’t very good - you could argue “But that doesn’t matter, what matters is that he writes good code”, however you would miss the point. Such behaviour has the potential to alienate current and future contributors - what open source projects need to keep going.