I have in mind to buy this add-on, but I think the best way to avoid advertising robots would be to agree with this other add-on: https://snogssite.com/threads/ozzmodz-login-spaminator-paid.3035/
My suggestion is to put both add-ons in the same package with a slightly lower price. Thank you.
Login Spaminator (prevent boots that have managed to register from logging in)
Contact Us Spaminator (prevent bots from flooding the contact email inbox)
They are the three fronts where the spam bots attacked with sophisticated software systems to avoid classic obstacles such as captchas. In my old domain, active for many years, I had many attempts by these ad robots to flood the advertising forum (until I decided to terminate the project for other reasons). In my new domain I do not have those persistent spambots, and it surprises me, but it has been active for a short time, they will not be long in coming, and I am looking forward to testing the effectiveness of these three add-ons (in the same order that I indicate).
I think the key is in those hidden fields that the bots go unnoticed (for now).