For the record, the author of those flowcharts is completely missing the point. You can just as easily call `git update-server-info` and copy the .git from your repo into a web-accessible directory, and just be done with it, the same as Darcs.
The reason people do it other ways (either via git-daemon, gitosis or ssh) is because Git uses a special transport protocol that's far more efficient than a dumb HTTP session. It's not that Git won't work over a dumb HTTP session, it'll just be a lot faster using it's own server/protocol.