When I started getting emails from companies asking for the spam-links from my sites to be removed I assumed it was a good sign. If they're cleaning up their spam-links then presumably Google have found a way to make those spam-links not pay. Hopefully fewer spam-links and robot-comments, no?
You are assuming the requests to take down links are coming from the owners of the sites the links are pointing to…
Though I was mostly surprised to see them at all, they were all been for a forum I thought I'd closed down years ago but had apparently been collecting spam for quite a while.
And they were spam, certainly. If I'd been monitoring the thing they'd have been deleted right away.