Found this great plugin for WordPress the other day, it blocks spam from things like Registration forms, WooCommerce reviews, Comments forms, and Contact forms!
And It covers a wide range of popular plugins too like JetPack, WooCommerce, Contact 7, etc!
A years service costs just $8 USD, and if you sign up with the link below you will get 2 months free!
The plugin also has a 14 day trial for you to try it out and see if you like it as well!