Should Apple Remove WhatsApp For Child Porn?

It seems that WhatsApp, a Facebook-owned messaging app, has had a problem with users sharing child porn. Apple removed Tumblr from the App Store because people were sharing CP on its platform. Should Apple remove WhatsApp as well?
A report from two Israeli NGOs reviewed by TechCrunch details how third-party apps for discovering WhatsApp groups include “Adult” sections that offer invite links to join rings of users trading images of child exploitation.
Policing WhatsApp is more difficult than Tumblr due to the former’s use of encryption. But it seems that these abusive chat groups had child porn in the group name itself, so they aren’t exactly sneaking around. Maybe Apple needs to give WhatsApp a time out.