I saw Tether put this out right after all the press about how Tether was being used by Iran. I doubt that Tether cares very much whether they freeze any particular country's coins or not. As long as they don't freeze too high a percentage of the total supply, people will probably just keep on using it and figure it won't be their coins that get frozen.

Also, I'll be surprised if the US is able to put very much pressure on Tether. With bond yields going up, they may begin punching above their weight.