unless Tether has a video camera that livestreams a bank vault where every bank node has been audited. and it shows the auditors doing an actual count that can be proven. where watching the livestream shows money-in money-out. you cannot ever fully verify it

banks can create money(loans) where by someone can take a loan. print out a bank statement to show funds. and then default the loan .. yet still suggest the bank statement is valid proof.. reality, its not

many people used to bounce cheques. they would deposit a cheque to create a balance on an ATM mini-statement and then bounce the cheque

some people would wire transfer money, bet a bank statement. then from origin bank doe a chargeback refund

some businesses "hire" auditors who fudge numbers in their favour