I too have been getting hit with this cr#p for months, though its got noticeably worse in the last 4 weeks.
As a side issue, I got an email from some affiliate manager trying to get me to add a group of Playtech casino to my site. As far as I'm concerned there are only a couple of PT casinos I'd promote and these weren't them. Didn't help that I'd been hit with a ton on spam from their affs for the PT casino this guy wanted me to promote.
I responded with "I'd rather eat razor blades than promote your casinos".
Get a response of why?...I told him you allow and support rogue spammers.
He responds, no, not at out casino's we will close any account that does this...
Hmmm, really
Spent the next 30 min's going through my spam bin and forwarding every spam to his email account from the Playtech casino's his aff program promotes.
Didn't hear from him again...
But the SPAM, yep that continued
Cheers
Trezz