Based on the extensive research I've been doing, here's what I found out:

A long time ago, Atlas, a Black Hole badge, used to require the successful completion of just 500 skills.

But then, the KA team performed a plan to raise it to a nearly impossible condition! First, they added Da Vinci as a placeholder of the old badge. Then, they took the existing badge and decupled the requirements so that there was a 4,500-skill gap between Atlas and the nearest Sun Badge.

Later, they removed Da Vinci just to widen the gap to 4,600 skills!

Why did this happen in the first place?