Do I need a professional email address to participate as a respondent?

No. Respondents don’t need to register or share an email at all.
Requesters, not respondents, are required to verify their professional email and identity, so they approach Respondents transparently. Respondents, however, are chosen and invited directly — your inclusion is based on the Requester’s decision that your perspective would be valuable.

We don’t need anything more, so we don’t ask for anything more.

The only optional exception is if you choose to participate in the Trust Circle feature of a Survey. To learn more about Trust circles, please read this article