But what I was wondering is what SpamCop do with all the reports to the SpamAssassin generic reporting address?
See the statement by Julian in this thread:
http://forum.spamcop.net/forums/index.php?showtopic=3129
Note: ignore pontifications that occur prior to Julian's statement. Julian is staff, the others are not.
In short, they do get used, but are not trusted to create a new entry.
From what I understand of his post, at least one trusted mechanism must report a host before it's considered for listing, but from there the generics can be used to boost the score over the listing threshold or keep it there longer.