Signature spammers are everywhere in the forum and not just in the off topic section. Like they've said they are l in the games and rounds, investor-based games and even in the beginners and help section etc.  The thing is,  the only solution to stop is for the campaign managers to take action against it. Be more strict with their rules and people might take effort into putting some thoughts in their posts and not just a plain shitty one.

Also the offtopic is not full of spammers, there are actually constructive topics in there, what makes it look bad is the posters.

Reporting them to mods won't stop them either unless they have been reported several times or if their posts are a bunch of nonsense.