Deploy Previews on Netlify offer a valuable glimpse into the future and provide insights and visibility to contributors and maintainers alike, but users must be mindful of sensitive environment variables that could be exposed during automated builds triggered by pull requests from unrecognized authors. To address this concern, Netlify provides controls over how environment variables are handled in these builds, including options such as deploying without sensitive variables, requiring approval to deploy, or opting out of restrictions altogether. These controls aim to provide greater visibility and oversight into the build process, while also allowing users to continue using Deploy Previews for their development and content authoring activities.