I think in some ways it's easier to just say "subprime" and then that quickly gives people the picture, though I think you're right, in Australia there is a cap of about 48% pa for "mainstream" credit, and the laws apply equally to all credit issued under that cap. Prime and subprime would all fall underneath that cap and lenders are free to charge accordingly for the varying risk. Only "pay day" lending exceeds that interest rate 48% and is capped at 68%pa under different laws from memory.
In terms of the examples you gave I'd guess MME is the most egregrious, that balance was bvasically all borrowed money and no equity, however I don't know a lot about the other ones you mentioned. SVR is the complete opposite and sits on a lot of equity, it would require a very big economic crisis to close up SVR.
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