They won't let you delete the card while you have an active nitro subscription. However, you auto-renew before the subscription expires. You aren't given a chance to remove your card and they continue extracting money from you.
Even worse, they somehow get your NEW card details (mine expired, I got a new CCV and EXP date, somehow discord got the EXP and that's all they needed to continue charging me. I didn't give it to them as I was expecting the card to be rejected for an improper expiration and I was not planning to renew.)
Discord CEO and CFO need to be tossed in jail for wire fraud and theft by wire.