Hi Jo
I tried out how to get rid of the bots ... the only thing seems to be to repeat and repeat curses, insults and non logical orders like - go and commit suicide .. then they start sending endless texts of no meanings and finally stay away --
As you can see the script here is lousy -- but its seems to be free software so maybe one can use and make something out of it ?
Even Ed Snowden seems to have noticed this -- his last post was from somewhere February --