Some low-rep users cannot post anywhere
I couldn't answer my own question due to the following error, even after captcha passed.
Oops! Your question couldn't be submitted because: users with less than 100 reputation can only post questions every 3 minutes; try again later.
Of note, I had a hard time wasting like 10 minutes to post a feedback here, similarly witnessing "oops" message so many times, which I think is not a good user experience.
I'm assuming it is a bug, no?