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The original was posted on /r/lifeprotips by /u/hecktarzuli on 2025-07-15 21:36:32+00:00.
Capital One Credit Cards (and others I believe) allow you to create unlimited credit card numbers (+exp/cvv) that point to your account that you can use on different websites/companies. That way if they get hacked, you only need to delete the virtual card and you don't have to change your CC# in a million places.
Those virtual cards can also be blocked! I use them everywhere so if a strange charge comes through, I'll know what company was at fault and it's also handy for shady companies that you want to make sure you can cancel no matter what.