American Express recently expanded the definition for what codes as a cash advance to include digital currency and digital precious metals products starting November 1, 2020. The definition will be further updated starting January 15, 2021 to include precious metal coins and bullion:
Effective January 15, 2021, we are updating this sub-section to add precious metal coins and bullion to the definition of Cash Advance in your Cardmember Agreement.
I guess that means no more mint deals to help meet minimum spend requirements.
Hat tip to kiwi0panda