Piefed by default auto-subscribes accounts to a curated set of communities, auto-hides downvoted content and downvoted posters, attaches icons to accounts to mark those that have beyond a particular threshold of downvotes and entirely blocks links to a curated set of sites because Rimu deemed them to be unacceptable.
The only saving grace is that at this point those (anti-)features are generally toggleable at least at the admin level, but that's thanks to wjs018.