Don't think it can be stopped at that level, the blockchain wouldn't know which account belongs to who and self-votes or voting people who delegate to an account with said account isn't always bad, it's only bad if that's all they do.
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Can't we have a maximum voting ratio for a particular account? Like, if my account only vote for you, after a certain time it would block me from voting?
We did try that a long hardfork ago, if you voted for an account more than a few times per day the next votes would lose 25% voting strength, but this also was easily avoidable through alt accounts.