Someone could write a bot and use the free 25% to counter all your votes. Nobody does but the technical, easiest thing to do.
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.
I talked about this already, months ago in one of my posts.
RE: Proof of Brain is Dead, Long Live Proof of Social-Value