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The Vulkit RFID blocking card certainly adds a layer of security between you and someone wanting to access your data. For example, I've seen hotel safes that can be locked and unlocked using credit or debit cards, and a Flipper Zero could be used to clone the card and unlock the safe.
So, while I think the chance of someone reading your card and using it for bad things is small, these cards cost about $4 each, which means they're cheap and easy-to-use insurance against such attacks.