If the bots are gaining enough karma to vote, maybe they deserve it. To prevent the use of bot farms (or people farms) to stockpile votes, maybe we could look

If the bots are gaining enough karma to vote, maybe they deserve it. To prevent the use of bot farms (or people farms) to stockpile votes, maybe we could look to the field of sybil resistance and digital IDs? Stack Overflow has been holding moderator elections for a while. How do they do it?