Snopes Runs Spam (2015)
so, it appears, that the debunking site snopes also runs spam services, so that they have business.

- https://youtu.be/NVmnLaTXylc
- Looking for Lisa Holst (Re: 10 Misconceptions Rundown)
- Jan 24, 2012
- CGP Grey
here's a research from 2016

- https://youtu.be/OjlKIjLWq-Y
- The Eight Spiders
- Oct 29, 2016
- LEMMiNO
Basically, snope's citation is never found.
(that is, “Lisa Birgit Holst” of “PC Professional, 7 Jan 1993” doesn't exist)
Snopes of course changes the article on their site http://www.snopes.com/science/stats/spiders.asp over the years.
As of 2017-03-19, it points out the thing is a hoax and they link to Scientific American article.
Is Snope Scamming?
Let's not forget, the real question here, is, is the person who ran snopes intentionally created fake stuff so that they can earn more money via ads on their website?
I'm inclined to believe so.
Instead of research on the 8 spiders issue, you can research on snope and the person who ran them. And find out if the guy actually run spam servers that send spam emails.