Well, to be fair and leaving aside uptime concerns and the general desire to always install packages from some server instead of a safe and trusted local directory (probably too obvious ;-), it would certainly be possible to add support for trusted externally hosted packages.
However, for some reason there's a strong resistance against doing this, which I frankly don't understand.
I agree with Stefan that the warning message wording is less than ideal. You'd normally call such blanket statements FUD, esp. since there are plenty external hosting services which are reliable and safe to use.
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