I'm not an ActivityPub user, but this post remindeds me of the initial comments to "Show HN: Dropbox" [1].
"For a Linux user, you can already build such a system yourself quite trivially by getting an FTP account, mounting it locally with curlftpfs, and then using SVN or CVS on the mounted filesystem."
"For a Linux user, you can already build such a system yourself quite trivially by getting an FTP account, mounting it locally with curlftpfs, and then using SVN or CVS on the mounted filesystem."
1: https://news.ycombinator.com/item?id=8863