Pointless spam blog comments?

Question

Fight against spam

Recently, spambots have been leaving comments on the blog. The text of the comments does not carry any semantic load and is written in English. language (considering that all posts are in Russian), there are no spam links. For example:
"Phenomenal breakdown of the topic, you shloud write for me too!"
"Is that ralely all there is to it because that'd be flabbergasting."
"Whoever edits and publishes these articles ralely knows what they're doing."
"Deep thikinng - adds a new dimension to it all."
"Ecnmooeis are in dire straits, but I can count on this!"
And the like.
Interestingly, these comments come in waves. That is, about once every two months, they begin to appear on all blog posts and are added within 2-3 days, and then they stop. Captcha is enabled, but bots bypass it.
What are these comments for? How to deal with them?

Answer 1

I think the bots are looking into whether you can post links, pictures, and other SEO crap to your blog (if you google the text of the comments, you can see that the bots leave users with links to google, bing, facebook, etc.). After they study, most likely, the site ends up in some kind of spammer database, from where it is already being sold by a spammer, with a selection by features (for example, you can insert links, there is nofollow, and so on).

Answer 2

There are no links, maybe there are other undisplayed tags?

Answer 3

Could the bots post comments with links, but the links were cut by the engine after the submission as potential spam?

Answer 4

Search for abandoned or unmoderated blogs.
Use a non-standard approach in protecting against bots.

Answer 5

An additional simple question on the registration form will solve the problem.