There's a bot called "glowposter" living on gameliberty dot club that scans Fediverse instance DBs and sends "x has been blocked by y" DMs to both x and y.
The problem with this bot should be obvious, but it basically stirs up trash mobs and encourages harassment campaigns against people who block other users.
Instance admins should also consider blocking gameliberty dot club because it's a "free speech uber alles" instance.