They are rel="nofollow" links. I think that makes it "okay" in the eyes of Google, but not certain. I've yet to see a primary source where Google clearly state

They are rel="nofollow" links. I think that makes it "okay" in the eyes of Google, but not certain. I've yet to see a primary source where Google clearly state that they don't mind what you do with nofollow links. It's clear that Google was originally ignoring them, but some of their policies around comment spam and such do suggest that they could pass along negative value to the sites being linked. It's just not clear what circumstances trigger that.