This will mean you don't pay interest I guess, but it's still free money for the scumbags.
You use your card, the bank says, ah, somebody's borrowing money, hey presto, let's make some out of mostly thin air, then you have to pay them 'back'.
Reckon they give a shit if you don't pay interest on that?
And as I alluded above, given 'debit' cards use the same system, what's the bet they've arranged it so technically you're borrowing money they pay themselves straight back out of your account or something...
'Financial services' is a euphemism for 'scamming motherfuckers'.