I have a form on my website to leave a message on the /guestbook I added the simplest and most basic of captchas and so far I got 0 spam. It’s been online for

I have a form on my website to leave a message on the /guestbook I added the simplest and most basic of captchas and so far I got 0 spam. It’s been online for months at this point. Sometimes a stupidly basic solution works incredibly well.