looking in the mitchett topic i find few opportunities to join signatures campaigns, the old ones are full, the opened one offers a little amount with many restrictions, yobit that accepts everyone is full too
don't see why people would create new account or buy them to join sig/camp nowadays?
in the other hand prohibiting sigcamp would have a dramatic effect in btctalk imo, would say a fall of 30-50% of posts in the short-medium term and the worst scenario another forum(s) could take the lead in long term (hard but possible)