First in first served. Law of the jungle.
No law of the jungle, cause you still have to meet the criteri as set (ATPL, 1500hrs, 500 multi). which is a lot more than the average airline like Easy, Ryan etc where all you need is a CPL plus a bag full of money,
and trust me within the first day the still get about 600-700 cv's so there is still plenty to choose from not to many will be hired with 1500/500 minimums
pd.