I have liked this one as well, but I am not fully caught up yet.

As for the downvotes, instance admins can see who up/downvoted any posts. I actually host my own instance for bot testing and monitoring for vote manipulation in the communities I mod. I agree with Kadath that you just occasionally see some user that has never commented or posted in the community downvote a bunch of posts and then never show up again. Lemmy is weird about anime/manga stuff.