Bots can actually vote for you. Steemvote can help you vote some selected accounts if you are too busy to vote. They are here on steemit too @steemvoter account. I doubt the bots in steemit may be the reason he dropped as I believed human presence on here outweigh that of the bots. You'll agree with me that the bots are like a two-edged swords that cut both ways. Most of them are actually doing some good. The bad ones are getting heavily downvoted too. Thank you.