Well, I never see they
I feel it is kind of blocking or even kind of spamming within rule.
Where is the spam for bumping the thread per month? since bumping the thread is allowed one per 24 hours.
13. Bumps, "updates" are limited to once per 24 hours.
As @logfiles said it's true, anyone feel free to advertising for their avatar space since chipmixer not adding a compulsory avatar for the campaign.