Yes. CoCs are toxic and all workplaces with CoCs quickly become gamed toxic work environments. It's a nightmare. I never accept offers to join places with CoCs. In order to be effective and efficient I require the ability to speak plainly, clearly and directly about code quality and design issues.

Companies that use these tend to stop making good code and products and start using lobbyists to use regulations to anchor their dismally low quality products and squash any upcoming free-thinking rivals with good design.