Someone could write a bot and use the free 25% to counter all your votes. Nobody does but the technical, easiest thing to do.
I see all of this as potential attack vectors. The user experience for new users is really bad ( RC delegations should happen more, but i dont do it too, so i cant say a lot about).
A new user can write 3 comments or whatever and then runs out of RC. Most of us have way to much anyway. Something worth to think about.
And imagine someone makes a bot that downvotes all new users. Besides the limit, they have that would be a huge problem in user experience. Since it's a decentralized system, it is what it is.
Is not like they have a right for rewards, that's right. But there is a reason social media platforms remove dislikes on scale.
RE: Proof of Brain is Dead, Long Live Proof of Social-Value