What could have triggered a question ban in this case?
93975
How many downvoted question are enough to incur in a question ban?
82521
Prevent protecting questions under certain circumstances
142919
Is there a system in place to prevent new users asking, answering and accepting answers to each others' off-topic questions?
38321
Why was an answer allowed on a question that was merged into another one?
83010
What should I do about a question where the OP has quoted an answer in the question but not accepted it?
140710
Can we please block questions that contain nothing but a URL in the title?
75143
How should self-deletes be evaluated in the question ban algorithm?
147553
Should unregistered users be prevented from posting questions on Stack Overflow?
115621
Can I request a moderator to re-activate my SO account that has been suspended because of mistake?
72565
Does deleting my own question or answer attract penalty?
73004
Questions voluntarily deleted by their authors, who later delete their accounts show to <10k users as "removed for reasons for moderation"
148072
Is it possible to find out reason of suspension for another user?
85518
How long does a ban or suspension on an SE site last?
5915
When does the question ban get applied?
128731
How many downvotes do you have to get to be banned from questioning/answering
92811
How many questions on meta have asked, "Why can't I ask this question when that question is open"?
20378
What does "positively received" mean in the conditions for lifting a question ban?