@masterroshi  @arcange  Can either of you explain where the authoring and curation rewards go after a down-vote bot zeros out the total?  Let's assume $2.00 in votes from 10 up-voters before the bot down-votes, zeroing out the Pending Payout reward value.

Also, is the SP used in the process of voting returned to voters, after a down-vote bot hits the post?

Do you know what motivates anyone to run down-vote bots?  Is there a payout to them?  Do they collect what would have gone to authors and curators?

Are either of you developers for the Steemit platform or know who the developers are?

Your insight and advice would be great.  Thanks.

As an FYI, the following is memo text from a transfer.  
>Hi *************, i am a collective run account fighting spam in spanish and trying to keep the blockchain clean. We are constantly looking for support and wanted to ask if it was possible to reach an agreement. **At the moment we both upvote quality posts and downvote spam because of the limited resources at hand, might sound counter intuitive but we want to secure the support of the community** and show we are about a clean chain, **but if the delegation requieres no upvotes we have no problem and will stick to it. We have a reverse fanbase bot ready to go** but at the moment we are working manually both curating and downvoting and leaving personnal comments. thanks for your time and atention. best regards ****************

Why would the recipient of the transfer and memo want down-voting exclusively?  And why is the memo author using up-voting as a tool to convince the community that their actions are all about a clean chain?