F tickets are fully refundable and changeable. That is why they are significantly more expensive than other tickets which get you a seat in the F cabin. You may change these tickets as often as you wish and, depending on the country of origin, you may even be able to refund them if you no show and call in after the no show.

At the same time, AA, just like other carriers, has a COC provision prohibiting ticketing fraud such as making a booking which you do not intend to fly. That is most often used against people who make a habit of purchasing a fully refundable ticket as a means to get through a security checkpoint. I suppose that AA might well use evidence of repeated lounge use as internal evidence as well.

In your case, I don't think that the changes you are talking about are out of line with the changing needs of people who purchase full flexibility.