I don't really see it as something easily abusable. Two accounts, one of which occasionally logs in for a short amount of time, while the other is not. The first one does nothing but view and like posts of the second, then logs back out, and then the second one logs back in. It's easy to track if you know what to look for.
Also, I know of a certain users who certain moderators have told me that they are aware of the user's numerous alts. Trust me, they know. They aren't morons.