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To be clear to anyone who's reading along here instead of the site, they're reissuing cards because they are changing the way their card issuance works in order to improve merchant compatibility (which is definitely needed).

As such they have to use, presumably, a different set of card numbers/prefixes/whatever that the card issuers dictate. No security incident prompted this.

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Typically privacy.com cards showed up as a prepaid card, and most merchants online block these. Curious to see how it improves acceptance rates.

Curious, why do most merchants reject those? How do they impose more risk to the merchant?

For post-paid things like cloud offerings, prepaid cards are much easier to get compared to debit/credit, so you end up with a lot more fake accounts that just run malware/use hundreds of dollars in resources in a month only to have that card decline after the money on the prepaid is already spent somewhere else.

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