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Github does not allow the same ssh deploy key to be used for more than one project, which would be very useful in some cases (e.g. CI server dealing with project with private sub-modules). I've seen various threads that seem to say that this limitation is there for 'security reasons', but I'm yet to see a convincing explanation about exactly what risk that would raise.
Note that the fact that Github doesn't allow Account Level keys to be reused makes sense (two users shouldn't share keys). It is only the restriction on Deploy Keys that I'm questioning.
And to be clear, I'm not looking for workarounds (create a dummy user, use multiple keys, ...), but only for a plausible explanation for this limitation on Deploy Keys.
Related threads:
- One showing a workaround
- One discussing the issue but not really going anywhere