Any use of multiple accounts, all receiving their own upvote, but owned by a single individual.
What exactly is wrong with an individual having more than one account, producing content for the accounts and having that content upvoted by the various bots?
The work goes into creating the content, shouldn't matter if it is one person creating it or multiple people.
For example, I have a second account for the purpose of publishing a series of meditations. There are others who do similar.