I'm actually pleased this case that a pilot's answer to one question can be linked to his/her answers to other questions. We should note, however, that answers to the first two questions--which contain borderline personally identifiable information--could be used by the survey authors to narrow the identity of a respondent. While this is hardly worthy of Edward Snowden, it might encourage some of us to be more temperate in answering the last two "tell us what you really think" questions.
Alternatively, dispense with the promised anonymity entirely next year and collect enough data to know, for example, how many of those with strong opinions about ADS-B or transponders or the siting of national contests are flying a full-race Open Class supership vs. a 20+ year-old Standard or Club Class glider. Soaring pilots don't appear to be shy about expressing their opinions for the record.
Chip Bearden
ASW 24 "JB"
U.S.A.