This is not 1984. It's hard to regulate/control what hundreds of millions of adults are doing to their children. Stories that get media attention of abuse overlook the thousands of incidents in which nothing happens.
Well exactly, but these are documented with the perpetrators evident, I doubt these maniacs are the kind to bother changing the default-open privacy settings on telegram, the group is known and they're actively talking about administering drugs which aren't approved, are known damaging, and are not qualified to do so.
The only proactive solution is deterrence, which starts with dealing with the idiots doing it in public.