The one thing you've omitted here is "why" your flights were delayed. Could any of these incidents been air traffic control/weather related? If so, AA's conditions of carriage only require they get you out on the next available AA flight with seats. They have very limited liability in those circumstances.

If the delays were caused by mechanical issue/crew shortages, a complaint after each incident would likely result in some AA miles, but it would be rare for AA to compensate for lost hotel nights or lost wages/work days, let alone free trips. It's just how travel is these days.

Don't quite understand why you're currently stuck in an airport terminal for 7 hours. Is it a customs issue, that they won't let you exit once you've entered the secure area? What's the reason for delay here? AA doesn't normally distribute food to passengers, though I did have a regional partner distribute sandwiches at LAX last year on a multi-hour delay to Sacramento, something that took me by surprise.