BCL
Engineer
What you have given an example of is not hidden city ticketing and is quite nonsensical. Hidden city ticketing only works on one way tickets with carry on baggage only. For example if I were flying from EWR to SFO and found tickets too expensive for my liking I might book a cheaper EWR-SFO-SAN fare. When my first flight lands at SFO I would simply walk out of the airport instead of boarding my connecting flight. Despite what all the friends of the airlines on this board claim the airline will not sue you nor will the authorities detain you. The airline might cancel your FF account, remove any status you have with them, and clawback any miles you have earned. That is why it is best to do this on airlines where you don’t hold status and have very few miles.
Some have done this on a flight that continues, and then the hilarity ensues when the headcount doesn't match, and then the searching for baggage starts once they figure out who left. Must be especially nuts without assigned seating like on Southwest.