At the start of the month American Airlines updated its rules to make clear that they would not reimburse hotel stays you book yourself when your flights are severely delayed or cancelled (you have to wait for them to give you a hotel room if you want them to cover it) and to say they don’t have any obligation to get you to your destination – they can just refund your ticket if they prefer.
Now they’re updating their rules again to further limit your right to a refund in the event of delays of over 4 hours.