I know for me at least, it seems to be one person who made a bot to downvote brigade me, somewhat bragged about it, then got instance banned for it. So now he just creates alts every day.
It's all a total waste of his time too. It's way easier and quicker for me to simply ban him, than it is for him to set up all these new accounts.
Some people are really strange when it comes to obsessive behaviour.
Saidit is a little too political. I'd prefer Lemmy not to be so political. Which is to my point, because some people on Lemmy seem to make their whole lives about politics and will stalk people who have different political beliefs. It's really weird. I'm on Lemmy under other names, and I don't post any politics stuff under those names. Lemmy is much more enjoyable without all the "Burn him because he likes Trump!!!" nonsense.
But there are some "neuro-divergent" people that try to throw in "Cheeto-Man" in every comment they see. Sigh...