Thank you, yes, I didn’t read carefully enough. But there is hope for Hypatia!

If I understand correctly, Hypatia will continue with a new maintainer and is now in the Izzy repo

Everything is better ;-)

i.e. mailbox.org, posteo.de; there are also protonmail and tuta.com, but they don’t have IMAP

Cryptpad Forms or Framaforms are good for simple surveys. For more complex surveys there is Limesurvey.