Also, why should I give my credit card number on https://lavabit.com/want-lavabit.php https://lavabit.com/want-lavabit.php. How do I know they are not storing m

Also, why should I give my credit card number on https://lavabit.com/want-lavabit.php https://lavabit.com/want-lavabit.php. How do I know they are not storing my card on their server?