Probably not secured, as generally secured cards aren’t really credit cards. They’ll probably determine credit limits based on credit scores. But considering their no late fees, no overages, etc. it’s possible this might be an unlimited card (soft limit), akin to AMEX unlimited / charge cards without a credit utilization portion being reported. It aligns with Apple’s “customer privacy” perspective, if the card will be reported at all. In a way, Apple not penalizing customers for paying late, goes against reporting to credit bureaus that they were late. It’s like saying “don’t worry about paying late, we’ve got you, we’ll only report you to the authorities.”