Call me paranoid, but I've always assumed urls are not permanent. Domains can change, usernames can change, and published things can be taken down. For example

Call me paranoid, but I've always assumed urls are not permanent. Domains can change, usernames can change, and published things can be taken down. For example, I may publish something as an online backup or a mirror of my real repositories, without any kind of guarantee whatsoever. ONLY sharing because I want people to be able to see how the things I do were made. I mean, even most FOSS licenses explicitly state that there are no guarantees of any kind. IMHO I think people should stop with the "if it's on internet, it must retain compatibility" mindset, and instead switch to a "this will break or disappear at any time unless explicitly stated otherwise" mindset.