in my opinion the signature campaigns on this forum are less effective and ultimately only social media is the goal of the current project. just be advised, this forum is also still around 2 years old.
I looked at the bounty section. And I checked som of the bounties.
PIXBY - no signature campaign,
also there is no signature campaign at bitcointalk forumTEE-COIN - no signature campaign,
also there is no signature campaign at bitcointalk forumYACHTCO - signature campaign is available
ICOIN - signature campaign is available
So it has nothing with altcoinstalks forum, the bounties don't have signature campaigns also at BTT forum