I have been getting a lot of link removal requests from companies that have in the past spammed my comment section. Most of them threaten that somehow their past spamming might threaten my google rating, when in fact they are actually worried about their own google search ranking. Here is my standard answer:
I might or might not get to it, depending on how I feel and how hard it turns out to be. I only have limited sympathy as your company placed those spam links on my site against my wishes and against the usage guidelines for the site and on posts that largely were irrelevant to your product. I had to go to considerable expense to move my server and add new software specifically to fight spam of the sort you were dumping on me. All I can say is that you reap what you sow. And as to your threats that my Google ranking is somehow in jeopardy due to your past behavior, I believe Google is fully aware of whether your site or my site should be penalized for such spam, and it is not going to be my site.
If I do bother to remove the spam, I usually add an update to the post itself saying that "[company with link] has confessed to being unapologetic spammers in the past and a link to their site [and I include the link] has been moved from the comments section at their request and moved to the main post to give their bad past behavior more visibility."