You should see moderation in effect starting today (May 31st) through app updates.

The system isn't mandatory. Viewers can opt out of voting if they'd rather not participate in a mini trial, and broadcasters can turn moderation off if they're comfortable with the occasional outburst. And Periscope is quick to note that this isn't the sum total of its anti-abuse efforts. You can still kick people out of broadcasts, limit viewers to those you know and report ongoing problems. The new approach primarily tackles Periscope's trickiest abuse problem: those hit-and-run comments meant only to cause some temporary grief and ruin an otherwise happy stream.