> 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.

...are you serious? Yes, I could do all of those things, then I'd have a terrible Dropbox-like clone that only I can use. And I'd be responsible for running it.

Human society is literally built on the idea of us not needing to do things that we could do for ourselves. Most of the things you can do "for free", or even "for cheap", are only on that value spectrum if your time is worthless.