I just enabled copilot and I see in the settings this is checked by default
https://github.com/settings/copilot
> - [x] Allow GitHub to use my code snippets from the code editor for product improvements > > Allow GitHub, its affiliates and third parties to use my code snippets to research and improve GitHub Copilot suggestions, related models and product features. More information in About GitHub Copilot privacy.
Should we still be concerned if opting out?