How to beat the spammers who post in the Q&A section?

Question

Fight against spam

Good afternoon!
The site has a Q&A section where spammers post questions using the same template - several times a day with a very illiterate description of "earning 15,000 rubles a day" and a link to their site, which is fraudulent (this is how it defines its yandex).
The site has a recaptcha, an Antispam be plugin. That is, you will not ask a question until you pass the recaptcha.
I entered their description in the search, they post on many sites, including very popular ones - vc.ru, spark.ru - everywhere the description is the same. And their site in the description is changing, that is, the links are different.
It seems to be nothing of the sort - I deleted this content and that's it, but it obviously interferes with users, and search engines have time to eat such pages, which may well have a negative impact on the image of the site.
Tell me what can be done?

Answer 1

To take money for publishing in an open section

Answer 2

The problem was solved - they made it so that if a question or comment with a link to an external resource, then it goes for moderation, and it must be approved by the admin so that it gets to the site