Its hard to say as an Avast User, ordinarily you have to log-on to connect to the forum that although allows connection to your forum account (though I believe it is checked on id.avast.com not internally on the forum).
Posting checks/validation used to be done using Captcha, many complained this was too difficult and had several attempts to get it right. So I don't know if this is a replacement or addition to Captcha as it is around 20 years since I was a Newbie and had to go through this.