So are we blaming encrypted chat for causing child porn to proliferate or are we blaming Amazon for not doing anything? If the apps is as it's advertised, it's end-to-end encrypted so there's nothing Amazon can do as they aren't privy to any of the data going through the system.
As for the assertion that "Amazon is attracting people who want to trade such materials" is borderline libelous. NBC is asserting that Amazon is marketing this app to kiddie porn perverts?
(And hasn't the same red herring been used against EVERY secure, end-to-end encrypted communications platform?)