All forums get spammers to different extents, Avast attracts a lot of attention due to popularity so just keep reporting if you find any.
I may add that spam usually doesn't last long here.
They are usually caught very quickly, either by reports by regular forum users or by those who have the power to deal with them. Many you will not even see as they are dealt with very quickly. This is helped by having people in different time zones that have the power to deal with them.
Very few are actually spam bots - but real people - given the number of complaints that the captcha screen is too difficult.
