The newest #DarkPattern? "10€ off for orders over 30€" is heavily advertised, so that you'll add stuff to your order to bring it over 30€ (presuming this saves money), at which point the progress bar that shows how close you are to 30€ shows that you are now saving 10€, but you have to find the right submenu to actually select this offer which has absolutely no downsides to you, and they are hoping you won't find it and won't notice you paid more money instead of less.