Why did the Arabs join the Allies to fight the Ottoman Empire?

The Arab revolt was the main cause of this.

Explanation:

with the exception of confusion, oil lines were being stolen from the Arabs. The Arabs were also already heated with the Ottoman Empire.

Faisal had hoped that he could convince Arab troops serving in the Ottoman Army to mutiny and join his cause, but the Ottoman government sent most of its Arab troops to the Western front-lines of the war, and thus only a handful of deserters actually joined the Arab forces

i really really really really really really dont know