1: Because there is already regular locks, bumplocks are just a way for mods to manipulate users into dropping a topic instead of outright making it clear they don't said topic to be discussed. Is not much different than shadowbanning. People are left with an impression the subject isn't popular when it is being actually censored.
2: Actually, I will try removing it again, if spam comes back I will re-enable it.
3: There are several ways to contact me and the potential problems tor posting could cause seems to be way bigger than a few people not feeling like using any of the available means to contact me.