The reason for this often is that the service works differently for different regions and depending on how it was implemented (as in launched quickly not thinking of multiple scenarios) you may have an account with US activity (transactions, kyc details, reporting, etc) that would be messed up if they simply switched the country flag on your account. So often customer support doesn’t even have the capability to do that, and the request has to go all the way to product managers and sent down to devs to handle just this one account. And a dev might suggest making this process easier and letting the customer do that themselves (requires streamlining reporting, transaction processing, etc), and this will be shot down because the estimated cost is much higher that processing this “one off” request. And this will repeat for all such one offs.