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A cooperating group could have very outsized influence in this system right? They could decide first in private which way to vote and make sure they have no cancellation and that they all use the same amount of points, this maximizes power per point.

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this is where Minimum Anti-Collusion Infrastructure https://appliedzkp.github.io/maci/ becomes important, ideally someone should be able to prove they have voted without revealing any information of how they voted, which makes collusion difficult. This is achieved in person with voting booths and making it illegal to photograph your ballot. zero knowledge proofs + sybil resistance mechanisms like brightid or proof of humanity might make it possible online too.

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