I don't think this is remotely fair or ethical
I think this is genuinely shameful of doordash and I'm not sure how to deal with this, even if I can get a refund I have several issues with this.
Why is it even allowed that doordash can find a different card on the account to use it for a separate purchase? I explicitly removed this card from the payment methods in the app for the doordash subscription (i don't even use this card for my doordash orders either, I use a different payment method so its surely not pulling my card info from an active current order, so where is it pulling my card info from?) and they have decided to keep it as a payment option anyway.
This also didn't notify me until today, 1 day and 1 month after this happened, with it only notifying me of the first time this is happening when it is happening a second time as of yesterday (pending charges). So now I am being charged yet another month on this card, before even finding out that they had decided without my permission to charge an entirely separate card. It's not much and I can still get use out of it so its not a big deal, I just feel this is a serious breach of trust and potentially even privacy.