Why is it more like a currency than any other object? It's not negotiable currency or legal tender.
People buy it and sell it. I don't see any difference between bullion, iron ore, frozen concentrated orange juice, and Pokemon cards. You buy a thing, you pay the sales tax.
Well it's more like a currency than any other object because it has been used historically to either a) be the currency, or b) back the currency. Sure that's not true today in the United States, but like, it's obviously different than frozen concentrated orange juice... can we not at least agree on that pretty tame assumption? Or is this just some semantics race to non-meaning?
Iron ore is similar physically, but it's really just a raw input material/ingredient used for heavy industrial manufacturing and production, it's never been intended to be an appreciating asset/hedge against inflation.
I'm unfamiliar with whatever tax is being referred to in this specific comment thread, but I'd be curious how something like $SIVR is handled, considering it's backed by actual silver in vaults. That could lead to some unintended consequences if the investment plans of a lot of money suddenly changes how it's being allocated.