Not op but there are several groups that are independent but essentially aligned on anti-Tesla motivation that have reasons to support campaigns against Tesla: TSLAQ, union supporters, oil producers, legacy auto, to name just a few. There are more. And FUD is well known and easy enough that even individuals can practice it, so I wouldn’t read too much into that.
I can understand anti-Tesla motivation considering that Tesla doesn't act in a responsible way: they call their system "Autopilot" when it really isn't that; and they don't take responsibility in case of a crash. Both of these things should imho be illegal but somehow they get away with it.
I was thinking hedge funds paying troll-farms to bash anything TSLA related when they're short the stock (yes I actually believe that is a real thing that happens all the time), but sure those too.