Security tools, encrypted messaging, jailbreaking tools, VPNs, file hosting tools, anonymity tools...etc.
The complaint itself cites 'writing instructions on how to use a VPN' as evidence that the developers were knowingly doing something criminal. A VPN!
You might hate crypto and believe that open source private money is different than open source private messaging. But that is not what the government's ability to jail these developers hinges on. Any argument prosecutors are making here could be made (and in many countries has been made) about any of the tools I list above. To cheer this on is to throw the past 40 years of legal advocacy around privacy, encryption, and anticensorship tools in the trash.