> OpenAI/ChatGPT/Codex, Anthropic/Claude and Google/Gemini all do this.

1. Everyone doing this doesn't mean it's acceptable.

2. Google Gemini explicitly says right under the chat box if you are a paid subscriber (Workspace):

     Your <company name> chats aren’t used to improve our models. Gemini is AI and can make mistakes.

Regarding Claude: As I have unticked the "Help improve Claude" checkbox, I was under the impression that Claude did not do this.

https://privacy.claude.com/en/articles/10023555-how-do-you-u...