The thing you're overlooking is financial motive. If there's money to be made selling illegal secure communications software to criminal enterprises, then someo

The thing you're overlooking is financial motive. If there's money to be made selling illegal secure communications software to criminal enterprises, then someone will make that software available and easy to use. You and I don't use custom e2e software because there are good products already available. To somewhat counter the point about unencrypted communication between criminals, see the leaked opsec guides of some terrorist organizations. They're fairly sophisticated and it seems unlikely that lack of legally available solutions would prevent them from acquiring replacements.