I came across this question and you guys here are successful in bringing this feature. Here is the message that shows up when you are about to ask a question which I think is good.
The help section says the reason for blocking a particular user is not disclosed. Is it not a bit offending? In my case, I wasn't a good questioner and asked 1 or 2 poor questions in my initial phase. But I have been contributing to the community or at-least trying to!
So if I am blocked from asking questions, don't I deserve to know the criteria? Isn't it scaring away future (top)contributors?