When onboarding friends.
The younger they are, you have to quickly show success. The youth are so gamified that a level 1 accomplished is necessary to move to the next level.
The older they are, you have to show how it's not much different than what they do now. The elder are resistant to change and need familiarity.
In both cases a WoS is a good fit. Going to your email to get a code is a simple level 1 task for the young and sending something via an email address looking thing is good for the the older group.
The rabbit hole has many levels, and getting someone their first SATs easily while using lived experiences is a good start for many.