It's been a few months, but CoActivate.org is back up! I'm greatly relieved, mainly because it means the US-based admins survived the pandemic.
If any CoActivate users are reading this, I strongly suggest you move any mission critical services to a new provider (if you haven't already). Public-facing content on CoA is being archived occasionally by the WaybackMachine (big thanks to Archive.org and the Archive Team), but I suggest you take a copy of any password-protected content in your projects if it's important to you.