MySudo comes from a different starting point. Anonyome Labs built it as a compartmentalisation tool, where each identity you create, called a Sudo, receives its own phone number, email address, messaging handle, private browser, and one virtual card. The card is a feature of the identity, not the centre of the product.
MySudo cards run on Mastercard, are issued by Sutton Bank, Member FDIC, and are powered by Marqeta. Every charge passes through to the single US credit or debit card you link, with a generic MySudo descriptor on your statement. Virtual cards are offered only to US-based users on a paid plan, and only work at US merchants billing in dollars, online or by phone.