I find it strange that they decided to end it in such a rushed fashion when the majority of American TV shows have the opposite problem of being dragged out for too long. There's easily been enough material to do two full length series in a less rushed way. The 8th series could have been just focusing on defeating the Night King, with the ninth moving the focus to King's Landing. The only thing I can think of is that all of the actors or on an 8 series contract, meaning that they could all demand a huge pay rise if it went to a ninth. I can't believe it's not making them money.