To me, this is the same thing as the bid bots that have a blacklist and point to the individual cases of plagiarism that they have caught, removed vote, and added to blacklist. It is a way to say "Look I am doing something!" while still being part of the problem. There is currently no shortage of SP available to downvote spam and abuse. Literally millions of SP delegated to that end already is sitting at or near 100% VP at all times. I have a hard time seeing this claim by large stakeholders that adding a downvote pool will exert any significant negative pressure on bidbot use as anything more than a smoke screen while they literally rob the poor to give to the rich by reducing the author/curator reward pool, decreasing author reward share, and changing the curve so that only a large dolphin/whale/bid bot post falls high enough on the curve to make the same or more than current curve. The change to the curve is the most insidious because it works in concert with the dust vote threshold - the chart from Stinc which you include in your post that shows the curves just flat out ignores the dust threshold. The beginning of that curve in fact is a flat line at 0 until the dust threshold is reached, and the new curve pushes the amount of SP needed to vote a post/comment above the dust threshold way to the right. Even a 4000 SP account will no longer be able to give any reward nor earn any curation by upvoting a comment, unless the comment also gets upvoted by larger accounts and falls above the new dust threshold. This literally kills all possibility of small to medium accounts rewarding engagement.

Can you honestly look at the screencaps below and tell me the problem is there isn't enough available downvotes to combat spam and abuse?