The pattern is that their reviewers are really bad and the appeal process is almost nonexistent. Improving the quality would probably be a huge cost and they have no real reason to do that.
The app is back up and the Element folks agreed that there was what sounds like child pornography reachable from their domain. Overzealous automation perhaps, but obviously not a conspiracy.
You can view child porn on Chrome, or receive it by email, or download it by Torrent. Yet I don't see anyone banning web browsers, email clients, and Bittorrent client.