Last night, I was flagging the Spam posts in the News Comments like crazy.
There were so many of them that I was getting a bit silly with the remarks I was making about the Spam itself seeing as it had been a long day for me and I was a bit out of it.
Having been a Moderator in the past on a different forum in the past, one thing I have noticed is 9 times out of 10, when it's a person posting the Spam for some other site such as these Chinese domains, I usually found the Spammer to be posting from India.
The other thing which is possible is who ever is doing this may possibly be renting a Botnet of the type which bypasses the CAPTCHA by using the Audible Help feature of the CAPTCHA to get it right 100% of the time.
This type of Bot can be blocked by disabling the Audible Help feature of the CAPTCHA if it is currently being used.