My guess is this might be similar to how company's sue people for trademark violations, even when they are not doing any direct damage to the brand i.e. to prot

My guess is this might be similar to how company's sue people for trademark violations, even when they are not doing any direct damage to the brand i.e. to protect themselves from future legal liability. If too many customers use the hidden city in a foreign airline flight, they might be found not be in compliance with route agreements. Some background on the subject: https://youtu.be/thqbjA2DC-E https://youtu.be/thqbjA2DC-E