Yes. It's very fragile. It's actually insane when you really think about it. How a lot of the current infrastructure today are very fragile on certain places.

Reminds me of this XKCD comic:

I think the best way to deal with this fragility is to make sure that you have redundancy.

I mean, posting your repo in Github is great since there's a lot of people using it. But you should also have your repo backed up elsewhere, preferrably in multiple places, just in case Github kicks you out.