I don't have time to check and train spam for all these
projects.
Spam filtering is especially difficult on ruby-core: it
enters via Redmine, so it doesn't have a distinct Received:
chain, and also gets mixed with non-spam bug-report text,
throwing off Bayes training.
And I'm not sure if those mirrors did anybody any good, even;
so lets not say its' a "service" to anybody :P
The actual mirrors remain up, for now, but who knows...
I care about decentralization too much to ask anybody
to trust me to keep anything up :P