Aussie Zone Signups

I'm wanting to lock down site signups. I need your help on what question to put to applicants that can be used to vet their application.

Why do this? I expect that as lemmy matures and grows, it will gain the attention of trolls etc that we do not want here.

Also with Beehaw defederating some larger instances with open signups, I'd like to avoid the same fate.