"Without notice, the Mastodon instance bitcoinhackers.org has shut down for good."
This is just untrue. I can't prove it by linking to the posts now because the instance is gone but NVK announced that he was shuttering the instance months ago. People tried to get him to hand the instance over and have someone else operate it but he wouldn't do that because the DMs on #mastodon are unencrypted and he didn't feel comfortable letting someone else have that data.