Bots are not a problem anymore, and will be less of a problem as the network grows.

@steemvoter is just one of a few autovoting services available. Despite their very low charge of 3SBD per month to use their service, they make a hefty $500 per day on autovotes. And the numbers suggest 1000+ subscribers. Assuming they use the service to maximise their voting impact, that's 40'000 autovotes per day on posts we can assume the voters did not look at.