Are far as I understand it and seen it pitched, the curve has nothing to do with bid bots. The curve is to prevent discourage large stake holders from splitting their stake to smaller accounts and voting their own spam.

Under this curve they would penalized for smaller votes that are easier to stay under the radar with. Thus forcing them to use larger votes to optimize rewards. The discounted downvotes included would be able to put further pressure on this behavior.

There was no numbers until this post to know why is considered a smaller amount to understand what it means in reality.

That’s how I understood the curve presented up to now.