First of all, why would you care posting on other signature threads. If your not the manager of that thread then leave it to the manager, guy has been hired to answers questions about the campaign. Basically, it will be considered as a spam on where you post.

It' not a general rule. For example yobit still count post on other sig. Threads. As you can see there are many yobit spammers acting like a manager answering and telling people to get accepted. (On secondstrade and 777coin threads)