This has been going on for a while .In early 2016, the PA announced that the amount of aid (from all countries) it received for all of 2015 was half the normal amounts Then, in 2016, Saudi Arabia didn't pay a dime of its $240 billion annual pledge from April through November and then announced it would reduce its pledge from $20 million a month to $7.7 million.
This is a large part of the reason that Mahmoud Abbas is cutting funding to Gaza. He won't cut services to his base in the West Bank but in Gaza he has forced thousands of hospital workers and teachers to take early retirement. He's hoping it pressures Hamas to join his government on his terms, but in reality he doesn't have the cash.
The real nightmare of the Palestinians is coming true. Their fear is that they are becoming irrelevant. And in much of the Arab world, this has already happened.