Change for a relaxed life
Did you happen to ask how many hours were SV 777 guys flying? You might be surprised to find that its the same as EK, but they are doing it by choice and getting paid for it.
In EK you have a career path, it might take you 10 years to become a 777/330 Captain, but the opportunity is there. In SV you might get the opportunity to become a Captain on the 320 in about 10 years, or you might get fired if they have enough locals to take your FO position.