There seems to be a lot of negative commet about this voting bot. If you are the owner, think about your T&C of use and include the age limit of posts, and do a one off refund of those users who were unaawre of the unexplained post age limit.....it'll be good for your PR.
Where do you see a lot of negative comments? The post age limit is a limitation with all steem posts, not specific to @upmyvote. Steem does not allow any upvotes to affect post rewards after 6 days 12 hours. It is something that is completely out of our control.