Steemvoter is not a bidbot, it's a curation service that allows users to automate their voting. What you witnessed on this post is Steemvoter using the vote of its opt-in guild members to vote on a community post. It's a guild charity vote, not a bid bot purchase. One cannot purchase Steemvoter votes.
RE: Post Rewards (Including SP Equivalence) Will Be Donated to This Emergency Fundraiser