It's important to note that youtube is not removing prageru videos, it was just hiding them from being suggested automatically unless you opt in to "non-restricted". There are plenty of parents that would object to their toddlers watching videos about the death penalty or abortion. "Liberal" videos about these topics were similarly restricted. All of the prageru videos are still accessible.

It is also the case that being restricted limits monetization on those videos, but advertisers don't want to be associated with those topics.