Strip image metadata on upload

add_filter( 'wp_handle_upload', 'yourprefix_strip_metadata_from_images_on_upload' );
/**
 * Overwrite the uploaded image with a new version that has no metadata.
 *
 * @param array $upload {
 *     Upload arguments.
 *
 *     @type string $file The path to the image file.
 *     @type string $url  The URL to the image.
 *     @type string $type The MIME type of the image.
 * }
 * @return array Unmodified $upload array.
 */
function yourprefix_strip_metadata_from_images_on_upload( array $upload ):array {
	// Return if the file is not an image.
	if ( ! in_array( $upload['type'], array( 'image/jpeg', 'image/png', 'image/gif' ), true ) ) {
		return $upload;
	}

	try {
		yourprefix_strip_metadata_from_image( $upload['file'] );
	} catch ( \GmagickException $e ) {
		// Do nothing.
	}

	return $upload;
}

/**
 * Strip metadata from an image file, but keep the ICC color profile data.
 *
 * @param string      $file   Path to the image file.
 * @param string|null $output Path to write the image to. Leave null to overwrite the original.
 */
function yourprefix_strip_metadata_from_image( string $file, ?string $output = null ) {
	$image = new \Gmagick( $file );

	// Check if we have an ICC profile, so we can restore it later.
	try {
		$profile = $image->getimageprofile( 'icc' );
	} catch ( \GmagickException $exception ) {
		// Raises an exception if no profile is found.
	}

	// Strip all image metadata.
	$image->stripimage();

	// Restore the ICC profile if we have one.
	if ( ! empty( $profile ) ) {
		$image->setimageprofile( 'icc', $profile );
	}

	// Replace the uploaded image with the stripped down version.
	if ( empty( $output ) ) {
		$output = $file;
	}

	$image->writeimage( $output, true );
	$image->destroy();
}