It’s a bit of dick move. Are you going to go up to people in your own face to face real world community and tell a bunch of people they are on your blacklist?
Oh hey shop keeper I know nothing about, florist whose work I saw at a party once, random dude in the elevator at the office. You are on my blacklist. I declare it to the city!
Who does that? Why do that?
This made me laugh:)