I mean, same goes for OpenAI. Why point out only Anthropic?

For OpenAI they also have a separate opt-out for stopping training on your codex environment:

"Codex has a separate Include environments setting in Codex settings that controls whether additional context from your Codex environments can be used to train OpenAI models. Changing your ChatGPT setting or opting out through the Privacy Portal does not change that setting." https://help.openai.com/en/articles/7730893-data-controls-in...