Yes. Even worse, they do not upvote your post but upvote their own comment to your post. Ran across this just today. In fact I found a pair of accounts where one was randomly commenting on other posts, upvoting their own comment, then their "friend" account was voting only their comment using delegated SP no less. No value in the comments or the posts; they are simply gaming the system to take author and curation rewards...
RE: Hey Rude Boy!