The amount of money isn’t really the issue, it’s the infrastructure for getting this revenue back towards public funds. That is to say corruption and a lack of internal organizations probably prevent a good portion of revenue from coming back to the people... And/or that they’ve already obligated themselves to other humanitarian efforts. Oh yeah and don’t forget existing debt obligations which are likely to be many factors larger...

Also, more importantly, you should probably google before shit posting as they roughly make ~$48bn of their GDP from oil.