There is no incentive to arranging a downvoting scheme targeted against a random poster on HN or Reddit, there is, however, a great incentive to do the same aga

There is no incentive to arranging a downvoting scheme targeted against a random poster on HN or Reddit, there is, however, a great incentive to do the same against a commercial competitor in Google search results. Negative seo is a thing and any commercial site that is remotely successful is targeted with it daily.