[jrochkind1]

Except you have to use an ATM debit card in the machine. If you wanted anonymity or lack of traceability, I think you'd rather buy with cash, probably using an actual in-person transaction.

(I don't know if the US or other countries require registering identity of people buying gold in person in cash? I don't think the US does).

[ef4]

Any cash purchase (of anything, not gold in particular) over $10,000 requires submitting a form to the treasury. Not that that's easy to reliably enforce.

[pavel_lishin]

You could always offer cash to passers-by to use their debit card to make the purchase.