Not sure what you mean by "guaranteed".
Downvote can be selected by delegator. But it can't be based on any personal agenda. Admins monitor it. However, if it is legit, then it is done as follows:
Every 12 hours delegators can propose 3 posts with a minimum of 24 hours until payout. Every 12 hours half the combined free downvote mana of all delegators is used to downvote the proposed posts, weighted by the delegated stake of the proposing users.
Thats what I mean. Actually looks like a great project because of that.
Thank you. I like it. People are cool and fun to work with.