the CVE thing seems to be a straw that broke the camel's back if anything. it seems a bit fucky to expect a core maintainer to work on your project without pay because you wanted to look virtuous by firing them during the initial invasion of Ukraine.
I'm sure if they, yaknow, paid him, the corporate procedures he was still bound to wouldn't be so bad.
doubt freegnix will get far, mind you, but I don't think it's entirely fair to call his reaction "sour grapes"