I've done a bit of digging and if you look at the RAKBANK prepaid portal [0] you can see the service is powered by ECS which is based in India [1], with offices in the US, UAE and Singapore.
Not sure about the other one, the bank of Muscat site is a bit crap, didn't find mention of the processor in the T&Cs or description of the cards [2].
More importantly electraCard is certified PCI compliant by Control Case [0]. I think, this is the primary reason electraCard's name is not on the news; it has been certified secure by the payment industry standard [1]. Either Control Case failed to perform audit properly or the hackers had some serious skills.
Not sure about the other one, the bank of Muscat site is a bit crap, didn't find mention of the processor in the T&Cs or description of the cards [2].
[0] https://www.rakbankprepaidcard.ae/CustomerPortal/WebPages/Lo... [1] http://www.electracard.com/contact-us.php [2] http://www.bankmuscat.com/cards/prepaidmain.shtml