The user blocks another user, and does not see his questions and answers. I think it will be a very useful plugin. There were many requests for it, but no one has ever implemented this for the whole time q2a existed. Many users in small communities conflict and just leave it, this would be a great solution to this problem.
Organize a fundraiser for this, I see that more and more people are abandoning q2a due to insufficient functionality and insufficient support for non-developers, which is very bad.