They are also not all that limited. I used a Privacy.com card for a New York Times trial subscription, which of course I could not cancel online, so I just let it expire. A few days past the renewal date, I saw a $waytoomuch charge on my card.
I wrote to Privacy, and this was their reply:
Jun 1, 2022, 5:21 PM EDT
I've been reviewing your dispute and wanted to touch base with you to explain what happened.
It appears that the disputed charge is a "force post" by the merchant. This happens when a merchant cannot collect funds for a transaction after repeated attempts and completes the transaction without an authorization — it's literally an unauthorized transaction that's against payment card network rules. It's a pretty sneaky move used by some merchants, and unfortunately, it's not something Privacy can block.
We are refunding the transaction to the original funding source used for this purchase. You should see this refund reflected in your bank statement in the next 5 business days. However, please note that since this merchant uses force posts, they will continue to do this monthly until the subscription is cancelled. Please contact them to have the subscription cancelled.
Let me know if you have any questions or concerns!