Anonymous Forum?

[gamer8391]

I have a website with a recently installed nodeBB forum that is aimed towards personal privacy industry.

The entire forum has guest posting enabled for privacy reasons.

Is there a way to:

1. Disable ip address tracking forum wide.

2. Present a question / answer challenge when users post to prevent abuse?
   I am aware of Google captcha but due to privacy concers this is not a possible option for us.

Ideally, if there can be a "Privacy Mode" toggle in admin settings when enabled would disable ip forum wide ip address tracking that would be awesome.

Thank you.