But you have to know to scroll down to it, and for non-GitHub users, that won't happen until one day they randomly scroll down and notice there's more info cunningly hidden at the bottom of the page.

GitHub (probably correctly) seems to prioritise ease of use for people actually using it as a source repository over ease of discovery for projects using it as their homepage. Which is why projects shouldn't use it as a homepage, and people shouldn't treat it as such, until it gets better landing-page support.

I suppose there may be some argument in that non-GitHub users may not be the target audience for these projects, mind you :)