Yeah.
I don't think there's anything that can be done about either issue, especially not a bot downvoting everything in sight.
Voting your mates has and will always be a thing, content doesn't matter in some cases as long as it scrapes average. Not ideal but this is what we have.
Stop bots - limit number of downvotes per account to 10 a day
Stop whale theft - limit value of downvote per post to 1HP
I'm no geek, but that is easy as....