Beginning RxSwift - Part 20: Challenge: | Ray Wenderlich Videos

In this challenge you'll use sharing, throttling, and schedulers to optimize and finish up Combinestagram.

This is a companion discussion topic for the original entry at

In the solution to the challenge, specifically in the MainViewController, why are you calling asObservable() again before each subscribe call, if you already called it when creating the shared subscription in line 41?