Install
This is the repository archive. It installs, but the folder name will carry the branch suffix and updates will not flow.
Install straight from GitHub with WP-CLI:
wp plugin install https://github.com/devgeniem/wp-gravityforms-db-prevent/archive/refs/heads/master.zipOn Packagist as devgeniem/wp-gravityforms-db-prevent:
composer require devgeniem/wp-gravityforms-db-preventNo built-in updater. New versions won't appear under Dashboard → Updates. Install new releases yourself, or let Git Updater track the repository.

Gravity Forms Prevent Database Storing
A Gravity Forms plugin to let the form creator decide if the values should be saved to database or not.
Installation
composer require devgeniem/wp-gravityforms-db-prevent
Then activate the plugin from the WordPress dashboard or with the WP-CLI.
wp plugin activate wp-gravityforms-db-prevent
Usage
This plugins adds a checkbox to the Gravity Forms form settings that prevents form entries to be stored in the database.
Technically the entries do get stored in the database, but they are deleted from there immediately after all the emails regarding the entry are sent. This is due to technical restrictions in the way Gravity Forms has been created.