This reminds me of the infamous comment when DropBox was introduced and why geeks don’t get it.

https://news.ycombinator.com/item?id=9224

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. From Windows or Mac, this FTP account could be accessed through built-in software.