They probably shouldn't but I had an instance with an ISP back in the day where they wouldnt accept my answer to a security question because the answer was ridiculous. The question was "in what city was your high school?" I put "Upyourassville." The ISP thought there was a problem and wouldnt accept the answer. These days I use my grandmother's maiden name as my mother's maiden name to answer these questions. There are people in my own family who dont know the answer to that.

Agreed; I'm using the same approach of my own 'recovery keys'. Usually it's possible to provide them in a recovery UI online. And in the case you need to talk to an actual human being, it's easy enough to explain the reason behind it.