"Detecting in code that the company is aiming at international expansion soon is probably not possible" It is somewhat, if you also keep some general variables

"Detecting in code that the company is aiming at international expansion soon is probably not possible" It is somewhat, if you also keep some general variables for this like "US_Only" that you have to keep track of, but yes, there are of course limitations with that approach. If you do it wrong, it gives just false security that blows up at the wrong time.