It's been down for a day, and may be down for a few more. Looks like "Just build your own Internet" isn't a viable option for internet communists, everyone must learn of their peaceful ways by force.
Trying to get to Saidit redirects you to Saidit's Subreddit, in a sad state of affairs.
EDIT:It's come back up since then. Updates in the link.
True, the only actual free speech you're going to get online is either in decentralized chats or in ancient unmoderated usenet boards.
Sadly true. KiA2 isn't even immune, and it's a sad state of affairs.