Spammers delight

I have been using CF7 on numerous sites for years (always updated). I am currently receiving torrents of spam messages, so tried adding Really Simple CAPCHA (not easy to do as it does not appear in the available plugins list). This is fine when it works but it breaks at least one of my sites by removing all page content apart from sidebar widgets!

It seems to me that spammers have really worked on CF7, so it is useless without CAPCHA, and their own tool is not up to the job.

https://wordpress.org/plugins/contact-form-7/