I suggest giving clear and prominent notification on the consequences of mass downvoting in any “you have joined the list” message, and a similar notification email to existing members.
Also, update the “How should I use my voting powers?” section of the FAQ with the same information.
An “Offenses Warranting Banning” section would be appropriate as well. It should state that it is not intended to be exhaustive.
I suggest giving clear and prominent notification on the consequences of mass downvoting in any “you have joined the list” message, and a similar notification email to existing members.
Also, update the “How should I use my voting powers?” section of the FAQ with the same information.
An “Offenses Warranting Banning” section would be appropriate as well. It should state that it is not intended to be exhaustive.