99% of crapcoin campaigns don't have any one managing their campaign at all. They accept hundreds of users and pay them for whatever they can be bothered to churn out (or copy and paste). A fair few of the current bitcoin campaign managers aren't doing a good enough job either or taking on too much work.
Exactly. In part, signature managers are somewhat to blame since they keep on accepting members that clearly doesn't have a good post history and good command in English. Most of these users who do spam are those that are enrolled in signature campaigns of ICOs and the managers don't do shit once these spammers are in the campaign--just exclude some posts that they "think" were spam.
This issue has been going on for the last two years and hasn't been addressed even once. SMAS doesn't do the trick as some campaign managers just accept members to get a pay from their respective bosses.