This article directs it's attention to email spam which is indeed an issue.

"What happens next? Once human attention becomes a gated resource, the prize is no longer reaching the human directly but tricking the gatekeeper into passing the message through."

That is where blog comment spam sits, and there a lot of blogs.

I wrote this in Nov 2007 and it persists today, across blogs and pretty much anywhere else that allows comments.

https://akismet.com/blog/it-really-is-spam/

Part of the continuing problem is that, for blogs, Akismet is effectively paywalled (One ad? You pay). Alternatives exist - use them.

What we have now though is spammers creating blogs then setting AI to comment on those blogs promoting spam and comments which then promote that spam.

It's a cesspit.

Don't read the comments.