There are hundreds of thousands of those images being transmitted fully-encrypted on WhatsApp, a fully-legal multi-billion dollar platform, every year. And that's just what users self-report![1] Why would any crook bother with Agora when they're already using fully-encrypted platforms like WhatsApp? What would be their thought process in switching? It's not like Bitcoin is particularly difficult to track, anyway.

Agora seems completely stupid and pointless, but let's not pretend that they're doing something disastrously morally harmful. More than likely, it's just a platform that will die out in a few months. Best-case scenario, it serves as a honeypot for people with Coinbase accounts that want to break the law. It's actually easier to track than people transmitting these sorts of things over centralized, encrypted platforms.

[1] A tweet by Will Cathcart, who's the corporate head of WhatsApp at Facebook. https://twitter.com/wcathcart/status/1423701475595755524