It seems that the specific script comes from https://integralads.com/ as stated by another commentator. I think the blame is to be shared here.

integralads is guilty of developing and selling this technology. Microsoft is guilty of buying it and using it Google is guilty of serving it. And why not also StackOverflow is guilty of offering that space to advertisers without enough vetoing of their ads.

After reading about integralads I'm not even sure if the purpose is to fingerprint, it seems to be more targeted towards detecting fraud, which does not require fingerprinting necessarily.

My point is that it's not as easy as pointing to one company and blaming them. This is a problem that concerns anyone on the Ad space.