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 So they have to update the smart-contract in order to block the addresses?

What if there were so many addresses that the smart-contract can't hold them all? Is there a limit on smart-contract size?

Or maybe the smart-contract can call out to ask the Tether server if it's okay? 
 What gas-fees is Tether paying to update the smart-contact with a new list of banned addresses? Less than the amount of dollars cancelled I guess, but need that be true?

Is there a hack here to get enough addresses banned they have to lock up the blockchain with banning addresses? 
 I think you answered your question. They can just call an API to see if an address is banned. It's easy peasy when it's centralized. 
 🤔 Seems hardly any point in it being on-chain at all then if every request to move one ends in a call to a central Tether server. 
 Yes, it's decentralization theatre 
 #crypto 
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