Credit: @jobthomas Automattic Happiness Engineer
https://wordpress.org/support/topic/remove-built-with-storefront-footer-link-2/

How to apply: search and install Code Snippets > add this snippet > apply everywhere

if ( ! function_exists( 'storefront_credit' ) ) {
	/**
	 * Display the theme credit
	 *
	 * @since  1.0.0
	 * @return void
	 */
	function storefront_credit() {
		?>
		<div class="site-info">
			<?php echo esc_html( apply_filters( 'storefront_copyright_text', $content = '&copy; ' . get_bloginfo( 'name' ) . ' ' . date( 'Y' ) ) ); ?>
		</div>
		<?php
	}
}
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