Is there any data on this? I'd be interested to see what % of real users they have.
Many times I've visited ProductHunt there's a top 4 app that doesn't seem useful at all that has tons of generic comments like "Great work!", "Can't wait to see what you do next!", "So useful!" (common on Twitter too).
Guessing you could get bots to vote + comment occasionally to build up their reputation and then use or sell your bot army to manipulate the votes for specific product launches later?