I'm happy to clean up the source a bit and put it on GitHub if people like it and prefer to host it themselves. I thought I'd host it myself under a short, memorable domain, so people can easily try it out and share short links to their progress bars.
If you are happy to share the code - I think quite some people would be happy. The openness doesn't guarantee, but usually leads to better security, performance, etc.
It is very nice of you to provide such a service (and for free, as I see), but your docs says we, users, better not update stuff faster than once per second and that's quite a big limitation for some big companies with lots of processes to track (which probably can't be grouped together into a single batch update as your docs suggest to do).
I'll work on cleaning up the code, adding some dev documentation and releasing it on GitHub when I find some time. Perhaps this weekend already!