This rule applies only to sythe.org and its excentions (e.g. Discord/Guilded servers) and is there to prevent DNT users from posting their advertisements in discusstion sections, or to use sythe to trade in any way. However, DNT users are not prohibited from conducting business elsewhere - other forums / Discords, unrelated to sythe.org in any relevant matter.
I understand the confusion, though, as we punish people for some off-site offenses, such as scamming, or severe black hat, but that's not the case here.