Otherwise, they are perpetrating fraud.
The fraud began decades ago when they started pretending that a piece of paper with the word DOLLAR printed on it was the same thing as an actual dollar. This idea is just one more scrap on the whole fraudulent midden heap.
I have some of those!
Under the image of the President (where it NOW says merely Ten Dollars), it USED to say (1934 SERIES):
Will Pay To The Bearer On Demand
Ten Dollars
And where our present bills say:
THIS NOTE IS LEGAL TENDER
FOR ALL DEBTS, PUBLIC AND PRIVATE
used TO SAY:
THIS NOTE IS LEGAL TENDER FOR ALL DEBTS,
PUBLIC AND PRIVATE, AND IS REDEEMABLE IN
LAWFUL MONEY AT THE UNITED STATES TREASURY,
OR AT ANY FEDERAL RESERVE BANK.
The 1928a series said:
REDEEMABLE IN GOLD ON DEMAND
AT THE UNITED STATES TREASURY,
OR IN GOLD OR LAWFUL MONEY
AT ANY FEDERAL RESERVE BANK.