Earlier quoted context omitted.
Using that site will get your accounts and sites banned here.
How do you determine that it's the site's owner? If I buy 1000 upvotes for mycompetitor.com, will you boot them? Attribution is a terribly hard problem, Google has the same issue with paid links, and handles with the Disavow Links tool, but that's a hack, not a solution, as it essentially means you have to buy services that get you and up to date list of links to your page so you can disavow them before Google hands…
In the more common case, though, it's clear enough who's doing it to take action. And you'd be surprised how often we get explicit confirmation of what happened. Sometimes a site owner will even passionately profess innocence and then sheepishly come back later with "I'm so sorry, you were right, it turns out my marketing-person/friend/teammate did it."