Witnesses are already doing things for voters / users but it's not obvious from the typical user's point of view, especially if he doesn't understand blockchain and DPOS. The majority don't even know what witnesses are, like @sebbbl said.
The goal of the program is, by upvoting directly voters / users (providing an actual, visible, immediate reward for their implication), to encourage them to broaden their vision fo Steem and get interested in the participatory democracy it proposes.
Let's prepare a list then, what does each of top 20/50 witnesses do for Steemians. Would be interesting comparison.
It's planned, as such a bot would be ineffective without educating voters. Or at least his purpose would be defeated by people voting only to get the rewards (upvotes).