Cannot join Discourse without sharing GitHub email

Objective

I was attempting to vote on https://community.getmailspring.com/t/1-17-2-breaks-dependencies-on-lts-debian-13-and-probably-ubuntu/14119 as the latest release has somehow passed testing when it breaks installs on some of the most popular distros on the market (Ubuntu, Debian, Mint, etc). However, there is no way to use the MailSpring hosting Discourse without sharing my GitHub email with a third-party service.

It would be nice if private signups were allowed.