Here’s another solution that Collegeboard (and the ACT guys) - put out a press release that states:
“Due to ongoing criminal activity in certain parts of the world, Collegeboard will no longer administer tests outside of the United States of America”.
At a certain point, the cost of dealing with the problems abroad will begin to surpass the income generated by the test. Then Collegeboard could just say it’s a money-losing proposition that we can no longer support.