I plan to have people type an application to register but will deny creeps and obviously bots. What would be the best questions to ask/way to tell that someone is a creep with ill intentions?

I have some ideas, but I’m looking for more, actual ideas from the Lemmy community. Ex: (if I make it a 13+ instance) What age range do you plan on interacting with? What do you plan on talking about with these people? What do you plan to do here?