You could have the reply text box monitor keystrokes, to see if it fells like a copy/paste response instead of a typed one...

Use a decision model like Jev ?

why EVERYONE is copying this ( NetworkChuck on Jev ) https://www.youtube.com/watch?v=Ck7wB7pdebQ

Insane Jev Use Cases You Need To Use Right Now https://www.youtube.com/watch?v=2nc_QMuNp18

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