it seems that they do give such authority...

there are many things that we engage in that bind to the thousands of corpoguv franchises such as registering a vehicle, obtaining a drivers license, loans, credit cards, bank accounts, etc etc... when you engage in these contracts, you voluntarily surrendered your RIGHTS for sets of privileges....

getting to a place wherein you have some kind of argument if ever brought before a particular jurisdiction is what the site is about... and it takes study and work - simply declaring that they don't have the authority is incorrect and would be ineffective.