Disney may have the ability to see this, but NOT in real time. They can only go back and look at things overnight after it has already happened. That is why they started locking
MDE accounts overnight when people used FP that were attached to profiles which hadn't entered the park. If they had the ability to see what was happening in real time, they simply would not let those FP work. I suspect that it takes too much processing power to make those checks, and so they query their database overnight, when customers aren't putting a lot of demand on the system, and identify those who have broken the rule, and the locks happen over night. The same kind of thing would apply here. They either remove the ability completely, or punish you after it has been done, but I don't believe that they have the processing power necessary to check each FP when a change party is being requested to see if tickets were scanned into a park.