I don't think that those spammy links have any link power any longer. Previously, even the spammiest links (contextual ones), can help ranking something in the mid-range, but now it seems with all the updates in place, they are no longer working like they used to, 3 years back.
I think the search engines may have tweaked a setting, which made these links practically useless and of no value - it doesn't increase any ranking or decrease, and even search engine penalties from such links have decreased, which could potentially mean that the spam links do not do anything any longer.