Your BS is ridiculous.
"For example, the fungibility of money means that a $100 bill (note) is considered entirely equivalent to another $100 bill, or to twenty $5 bills and so on"
and cash has even identification numbers on it.
1 Bitcoin = 1 Bitcoin
and because Bitcoin is decentralized and is peer-to-peer no one can stop anyone accepting Bitcoin
Bitcoin is fungible money!
Fungibility - Wikipedia