On my forum if you replace http: and keto one can at least alert guests not to click on the links and that may help. At least it is not difficult to implement.
from my forum (note spaces around SPAM and SPAMMER - helps them stand out):
Put the word to be censored on the left, and what to change it to on the right.
http: => SPAM
KETO => SPAMMER
given:
http://www.badguy.com => SPAM //www.badguy.com
this is keto crap => this is SPAMMER crap
Members posting url's in a post would learn to use the short version without the http:
www.rcgroups.com
Is spam the correct word or does that only apply to emails?