1: Infidals machinations against muslims. 2: Muslims were (are) weak due to their weak economies and almost non existent arms industries.
But alhamdulillah situation is changing now with turks coming up fast. Iran and Pakistan are also adding to their military might.
West will not be sitting idle watching their world order unravel before them. They will definitely try to prolong their donination as long as they can but they can't do much with their ageing population and dwindling economies.
Just before the afrin op there was a lot of noise about it being a mountainous region and so would prove a graveyard for turkish troops. In the end the kurds surrendered meekly. The western propaganda would make the kurds look like superheroes.