Totally agree with you. I see on the schedule that there are two Saints games that will be pay-per-view on prime. It looks to me like the NFL wants to gradually convert games to pay-per-view. I’m sure to make a lot more money. My guess is they are betting that they are popular enough that people will still want to watch the games.
It's not PPV. You have to have Prime to watch, but you only need to have an active subscription. You don't need to purchase the game itself. That's included in the sub.