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WordPress demands conf organizers share social media logins.
(www.theregister.com)
This is a most excellent place for technology news and articles.
Drupal. Grav, Strapi, Postlight, and many others if you want to self host. SquareSpace or Hubspot if you don't want to self host.
Grav and strapi are open core only (arguably so is wordpress though), I'm not familiar with postlight.
That's all fine for technically inclined people, not for the scores of tech illiterate folk that need a big "migrate" button.
Hubspot or SquareSpace will do that for you
There's probably already a bunch of forks people could move to, if needed, people could coalesce around one. That should be a drop-in replacement that the hosting provider could even do for you.
Please don't fork WordPress. There's better CMS out there. Look up WPForce if you'd like to see just how terrible WordPress is
It was already forked as classicpress.