You will get downvote only if you buy bot upvote after 3.5 days or if you use bot that allow upvotes after 3.5 days.
Make sure the service you're using is GumpyCompliant by checking in the "Max Post Age" row is it's less than 3.5 days on @yabapmatt bottracker.
If you don't abuse system, you are safe.
RE: Grumpy Report 01/19/2018