They're saying the difference is that Signal doesn't say it. If you ask Signal about their support of terrorist groups, they'll say Signal doesn't allow terrorism on its platform (even though it obviously does since it has no way to know). Those are the Right Words. If you ask A/I, they said they didn't care if someone was a terrorist. Those are the Wrong Words. There's a social game being played at the highest levels that A/I have forfeited.