Two posts in particular on here receive almost all the comment spam. I have changed them both to say “Do not post comments here, they will be spam-trapped” which should prevent mortals falling foul of the mechanisms attached to those two posts.
I tried an experiment the other day and made them password-protected. So the link the spammers use to get to those pages still works, but they cannot post anything. This has – for the time being – stopped much of the spam.
I expect in due course they will just pick another ppst and target that instead.