And the reasoning? As always Terrorists, pedophile, criminals, etc. Guess what: If those guys have not learned yet to make a big detour around official chat apps, they deserve getting caught. My bet is, those people already have their own secured means of communication. Maybe they have their own encrypted app, or they have a forum somewhere in the Darknet, whatever. But the chance that this new law will catch anything worthwhile is practically nil.
The best way to get a good answer is probably to ask the man on anything cuneiform, Dr. Irving Finkel.