The moderators have been very active in finding and deleting such threads when they pop up around the forum before some unsuspecting member would click on the malicious links.
This seems to be the new rave of spam and scam on the forum, hopefully it would eventually die down, as some others have done in the past, when the users realize that their efforts is not yielding result. This would however only be possible if mods and users collectively stop the menace.
It seems that spammers have found a new way to circumvent captcha validation or they use some paid captcha solving services.
Bypassing captcha is not the main problem, except their are browsing using TOR.