Idk, I checked on lemvotes.org and they seem like real people

pretty much anything that gets more than like 100 upvotes will have at least one downvote (including lemmy, reddit, youtube before they effectively got rid of dislikes, etc), I also don’t really know why but it’s basically universal

it seems like ideally it shouldn’t attempt to preview the link before a user tries to view the content. i guess that would increase latency for users though