YPJT, you are an airport owner. I come along and say "If you install my system for free at the GA gate, neither you or your staff will ever have to worry about GA security access again, and especially not out of business hours. The whole system is approved by transport security. It even generates lists of who has been coming and going for you for free.
Airport owner signs up. A solar powered "gate guardian" with either fixed wireless or cable internet access is installed at the GA gate. Maybe with a keypad or key lock for police and emergency service use only.
You, mr. Pilot are told that the "new", "convenient" way for you to access this airport is via a subscription App for your iPhone or Android phone, but wait, there is more. After an initial Three months period, the new "Gate Guardian" system is the ONLY way you can get airside access!
We roll out the system to all regional airports and voila! We sit back and rake in annual subscription income from the pilot community! This is the "as a service" business model - you keep paying again and again for what should have been a one time charge ..for a gate key. for example.
To put that another way; "&*^k writing the CTAF frequency on the inside of the gate! THERE IS MONEY TO BE MADE!!!!