Moderation concept for issues on git repositories

Hi guys,

Open source projects is amazing, but sometimes, noob users usually more disturb than help and collaborate on issues.
Because this I think that is good idea to implement moderation option on issues, so repo owerns and moderators
may ban user on specific issue or on all repo issues.

Example, I want to ban octocat on my awesome-devops repo on "Add Puffin" because she is spamming on issue,
I can enable ban and put reason "you're not following the rules", then when octocat try to comment,
will not possible, because is banned and will display to octocat "You can't post on this issue, reason: you're not following the rules".

Like this, if octocat is banned on all repo, she can't open new issue and display too "You can't open this issue, reason: I don't like you".

This idea is to prevent this as example: https://github.com/git/git/pull/233

This is only a concept, what you think guys?

Original idea: https://gist.github.com/joubertredrat/05759a27b71a4e2da72f9079edc9694b
Issue on GitLab: https://gitlab.com/gitlab-org/gitlab-ce/issues/19801

The issue names no files, tests, or entry points; begin by confirming whether this concept is still wanted and defining the moderation scope and permissions. It is complete only when the project has an agreed specification and corresponding implementation and tests for the described blocking behavior.