JVzoo is the weak link. All spam originates from there, and it's always "Warrior Forum type" junk. In other words, how to do "SEO" (not SEO), get rich quick, etc. So even if it was "legit" non-spamming businesses, the information would be crap. It's not WF directly, as far as I know.
It got into our main affiliate email account, as well as my personal account. So I keep adding rules for the former, and letting Yahoo take care of the latter. Almost all of it is from Romania, and I just keep blocking that country's /16s. There's zero legit traffic to this site from that country.
WF can be useful, but 99.999% is crap. I'm not exaggerating either -- literally 1 in ~10,000 posts is worthwhile. But I go for the 1. The whole place is almost pure spam from "marketers" (people with NO education/degree/experience in marketing) that couldn't sell food to a starving person. For example, what I find funny is how all the WordPress ebooks/tutorials always spend 90% of the time showing how to install it and plugins, and almost zero time talking about anything of value. So sad, so pathetic.
But I know you know all this.