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Real criminal organizations have their own software.
Real criminal organizations will know that proprietary software is less secure than open-source stuff.
A proper criminal should use Signal or another open-source e2ee messenger, and so should you.
(Signal is blocked in Russia)
Real criminal organizations literally have their own software. That software has proprietary encryption, and masquerades as regular internet traffic. Frequent updates are made to change the patterns it uses so it remains undetected.