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End-to-end encryption means that no-one apart from the sender and recipient have access to the cleartext.

To detect what end-to-end encryption is used for I suppose that you need to scan and analyse the cleartext.

So...

I should have perhaps phrased that differently as: If I desire end-to-end encryption but I do not want to be a conduit for nefarious activities then what are the options? Surely there is a spectrum between facebook messenger and a total secure, end-to-end encrypted chat client.

The option is to write your T&Cs accordingly. Of course that won't prevent anything but may help you act against someone that has somehow been found to breach those T&Cs.

There is no magical solution here.

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