@openstreetmap I received the email and checked the web site, but there are no hints about the argument of the questionnaire until (probably) after you accept of answering. Since the arguments are unknown I did not accept.
@CjMalone Thank you very much. I am not subscribed to the English mailing list, so I wasn't aware of this.
@telemaco @openstreetmap it's been documented on the talk mailing list. It's not terribly interesting, but it didn't take long.
https://lists.openstreetmap.org/pipermail/talk/2021-January/085956.html