Is there a downvote bot on lemmy or something that downvotes a post regardless of the content ? If there is a downvote bot what can we do about it ?

Some people use apps which hide posts they have interacted with. A downvote counts as interaction so people in turn then liberally downvote nearly everything. Yes it's unhelpful and dumb. Solution, use kbin and at least you can see who downvoted you! (Except I don't think downvotes are federated).