I have that message when I try to ask question on superuser:
Sorry, we are no longer accepting questions from this account. See the Help Center to learn more.
My reputation history is not bad, it's almost empty, even when "show removed posts" is checked.
Is this some kind of bug or deleting one dumb question about fedora download caused my ban?
This is my reputation history (I think screenshot is better than copy-paste):
I have accounts on Stackoverflow (5k reputation), Electrical Engineering (2k reputation) and... ban here.