The Saudis aren't "daring" with megaprojects. They're fucking[1] stupid[2]. Saying their megaprojects are "daring" is like saying I'm "daring" for claiming I'm going to build a catapult that will launch me to the moon.
[1] https://en.wikipedia.org/wiki/Trojena
[2] https://en.wikipedia.org/wiki/The_Line,_Saudi_Arabia