Hello,
I do not really know much about Digg. But it seems such companies like Youtube etc have these policy where they do not fully investigate somehting then jump in with no facts and make assumptions. Digg should have a real human control what is deemed spam etc etc. Banning legit
SEO based websites is not on. However this user tactics and company policy seems amateur and totally un-professional. People just will not use their system I think.
Thanks,
Leo