I often get asked whether Divi Booster has the ability to add Google's reCaptcha to the Divi contact form. It doesn't at the moment (though if you'd find that useful, let me know in the comments). There are however a couple of existing plugins which can be used to...
This site is supported by affiliate links to products that I think may be of interest / use to you. I may receive a commission on sales of these products.