It is a quality check survey run by a company called Imperium (I think). If they don't like your answer you don't get the survey it's attached to, that needs 'good quality respondents'. But they don't seem to record your result and re-use it on other surveys with the same requirement, so we often get it multiple times in the same survey-taking sitting. I strongly suspect it also uses an automated algorithm to classify the passes/fails. I think it probably looks at number of words used, lack of special characters, repeated words, repeated letters and time spent in the mini-survey.